Section 1 - NHRA.com

2015 Supplemental
Rulebook
UNLESS OTHERWISE NOTED, RULE CHANGES BECOME EFFECTIVE IMMEDIATELY
LAST UPDATE: 1/30/15
National Hot Rod Association
This supplemental rulebook defines technical guidelines for vehicles participating in the
NHRA Harley-Davidson Drag Racing Series and that are not currently defined within the
NHRA Rulebook.
The rules and regulations set forth in this document apply specifically to such vehicles
and riders, and to performance and conduct at any NHRA member track.
These rules and regulations are excerpts from, or supplements to the NHRA Rulebook.
Participants and track officials should consult the current NHRA Rulebook for additional
applicable information. Unless otherwise noted the requirements of the General
Regulations section are applicable to all vehicles included in this supplement.
NHRA rules may be added, deleted and/or amended from time to time and at any time
by NHRA. It is the participant’s responsibility to stay abreast of all NHRA rule
changes that may affect the participant. Additions, deletions or changes to the
Rulebook (collectively referred to herein as “amendments”) will be communicated as
follows:
1. Publication in National DRAGSTER; and/or
2. Publication on NHRARacer.com
Logo Placement on NHRA Harley-Davidson Drag Racing Series Motorcycles
In all NHRA Harley-Davidson Drag Racing Series categories, the NHRA Harley-Davidson Drag Racing
Series logo must be displayed on both sides of the motorcycle in a prominent location at all times during
NHRA Harley-Davidson Drag Racing Series events. Must use the official decal supplied by NHRA. In
addition, at least one NHRA Championship Drag Racing logo must be displayed in a prominent location
on the motorcycle. Must use the official decal supplied by NHRA.
2
TABLE OF CONTENTS: 2015 NHRA Harley-Davidson Drag Racing Series Supplemental Rulebook
SECTION 1: 10.50 INDEX CLASS ................................................................................. 6
ENGINE: 1 ...................................................................................................................................................................6
DRIVE TRAIN: 2 .........................................................................................................................................................6
SUSPENSION AND BRAKES: 3 .............................................................................................................................6
FRAME: 4 ....................................................................................................................................................................7
WHEELS AND TIRES: 5 ...........................................................................................................................................7
BODY: 6 .......................................................................................................................................................................7
ELECTRICAL: 7 .........................................................................................................................................................8
RIDER: 8 ......................................................................................................................................................................8
SECTION 2: HOT STREET ............................................................................................ 9
ENGINE: 1 ...................................................................................................................................................................9
DRIVE TRAIN: 2 ....................................................................................................................................................... 10
BRAKES AND SUSPENSION: 3 ........................................................................................................................... 10
FRAME: 4 .................................................................................................................................................................. 10
TIRES AND WHEELS: 5 ......................................................................................................................................... 11
SEAT: 6 ...................................................................................................................................................................... 11
BODY: 7 ..................................................................................................................................................................... 11
ELECTRICAL: 8 ....................................................................................................................................................... 11
SUPPORT GROUP: 9 ............................................................................................................................................. 12
RIDER: 10 .................................................................................................................................................................. 12
SECTION 3: DRAGGIN’ BAGGER .............................................................................. 13
ENGINE: 1 ................................................................................................................................................................. 13
DRIVE TRAIN: 2 ....................................................................................................................................................... 13
BRAKES AND SUSPENSION: 3 ........................................................................................................................... 14
FRAME: 4 .................................................................................................................................................................. 14
TIRES AND WHEELS: 5 ......................................................................................................................................... 14
SEAT: 6 ...................................................................................................................................................................... 15
BODY: 7 ..................................................................................................................................................................... 15
3
ELECTRICAL: 8 ....................................................................................................................................................... 15
SUPPORT GROUP: 9 ............................................................................................................................................. 15
RIDER: 10 .................................................................................................................................................................. 16
SECTION 4: STREET PRO .......................................................................................... 17
ENGINE: 1 ................................................................................................................................................................. 17
DRIVETRAIN: 2 ........................................................................................................................................................ 17
BRAKES AND SUSPENSION: 3 ........................................................................................................................... 17
FRAME: 4 .................................................................................................................................................................. 18
TIRES AND WHEELS: 5 ......................................................................................................................................... 18
SEAT: 6 ...................................................................................................................................................................... 18
BODY: 7 ..................................................................................................................................................................... 18
ELECTRICAL: 8 ....................................................................................................................................................... 19
SUPPORT GROUP: 9 ............................................................................................................................................. 19
RIDER: 10 .................................................................................................................................................................. 19
SECTION 5: PRO GAS ................................................................................................ 20
ENGINE: 1 ................................................................................................................................................................. 20
DRIVE TRAIN: 2 ....................................................................................................................................................... 20
BRAKES AND SUSPENSION: 3 ........................................................................................................................... 20
FRAME: 4 .................................................................................................................................................................. 21
TIRES AND WHEELS: 5 ......................................................................................................................................... 21
SEAT: 6 ...................................................................................................................................................................... 21
BODY: 7 ..................................................................................................................................................................... 21
ELECTRICAL: 8 ....................................................................................................................................................... 21
SUPPORT GROUP: 8 ............................................................................................................................................. 22
RIDER: 10 .................................................................................................................................................................. 22
4
SECTION 6: PRO FUEL HARLEY ............................................................................... 23
ENGINE: 1 ................................................................................................................................................................. 23
DRIVETRAIN: 2 ........................................................................................................................................................ 23
BRAKES AND SUSPENSION: 3 ........................................................................................................................... 23
FRAME: 4 .................................................................................................................................................................. 24
TIRES AND WHEELS: 5 ......................................................................................................................................... 24
SEAT: 6 ...................................................................................................................................................................... 24
BODY: 7 ..................................................................................................................................................................... 25
ELECTRICAL: 8 ....................................................................................................................................................... 25
SUPPORT GROUP: 9 ............................................................................................................................................. 25
RIDER: 10 .................................................................................................................................................................. 25
SECTION 7: TOP FUEL ............................................................................................... 27
ENGINE: 1 ................................................................................................................................................................. 27
DRIVETRAIN: 2 ........................................................................................................................................................ 27
BRAKES AND SUSPENSION: 3 ........................................................................................................................... 28
FRAME: 4 .................................................................................................................................................................. 28
TIRES AND WHEELS: 5 ......................................................................................................................................... 28
SEAT: 6 ...................................................................................................................................................................... 29
BODY: 7 ..................................................................................................................................................................... 29
ELECTRICAL: 8 ....................................................................................................................................................... 29
SUPPORT GROUP: 9 ............................................................................................................................................. 29
RIDER: 10 .................................................................................................................................................................. 29
5
SECTION 1: 10.50 INDEX CLASS
"SEP" followed by motorcycle number.
Reserved for street legal or non-street legal Harley-Davidson and Buell V-Twin
motorcycles with VIN # on frame or engine. All entries must have an 10.50 E.T. dial-in
index. Must use some Screamin' Eagle Performance Parts and display Screamin' Eagle
Performance Parts decals.
Current Record Holders
1/4 MILE:
No record can be established
1/8 MILE:
No record can be established
REQUIREMENTS AND SPECIFICATIONS
ENGINE: 1
ENGINE
Must be V-Twin cylinder engine. Must be approved by Tech Inspector. Crankcase and
all tanks containing fluids must have vent tubes routed to catch can or have a non-spill
breather system on motorcycle. Any engine modifications are legal.
Example: fuel injection, supercharger, E.F.I., turbo-charger, nitrous oxide, double
engine, etc.
FUEL
Gasoline, alcohol and nitrous allowed. No propylene oxide.
DRIVE TRAIN: 2
CHAIN GUARD
Must have chain or belt guard for primary and secondary drives.
TRANSMISSION
May be of any variety or manufacturer with any number of speeds. Must be approved by
Tech Inspector. May have any variety of a manufactured clutch. Belt drives are legal.
Rear wheel drives may consist of any ratios and materials. Air shifters and automatic
transmissions are legal as are other shifting devices.
SUSPENSION AND BRAKES: 3
BRAKES
Front and rear mandatory (disc or drum).
6
CONTROLS
Handlebar controls must be located in safe, workable position. Foot pegs and foot
controls must be located in safe, workable position and must be mounted in a safe,
craftsman-like manner. All controls must meet or exceed OEM equipment standards.
Snap-back throttle-return is mandatory.
SUSPENSION
Front suspension minimum size 30 mm and minimum travel of 2 inches. Rear
suspension not necessary. Struts allowed.
FRAME: 4
FRAME
Any stock production or any style chrome moly or steel frame. Only mass- produced
aluminum frames allowed.
Ground Clearance: Minimum of 2 inches with rider on motorcycle and 10 p.s.i. in rear
tire (includes exhaust and kickstand).
WHEELBASE
Unlimited.
WHEELIE BARS
Are legal and recommended. Motorcycles fitted with racing slicks must use wheelie
bars.
WHEELS AND TIRES: 5
TIRES
Can be D.O.T. approved with 2/32 tread or specified for racing use by manufacturer.
Any size is legal.
WHEELS
Stock OEM wheels or aftermarket performance wheels. Any size.
BODY: 6
BODY
Stock OEM fenders and gas tank, or custom fenders and gas tanks are allowed but
must be mounted and constructed in a safe, craftsman-like manner. Rear fender must
cover the width of the rear tire and extend beyond the vertical centerline of the rear axle.
Shells are legal.
FAIRING
Allowed.
7
SEAT
Stock OEM or seat with a step to prevent the rider from sliding backwards. (Motorcycle
must have a manufactured seat on it.)
ELECTRICAL: 7
IGNITION
Any ignition system is allowed. No delay boxes or electronic throttle stops. Charging
System: Not necessary.
STARTING SYSTEM
Electric or kick, external starter. Battery top covers are required. No rollers. No push
starts. No dry hops in pits.
CONTROL SWITCHES
Must be mounted and constructed in a safe, craftsman-like manner. Motorcycles 10.99
(*6.99) seconds or quicker must be equipped with a positive ignition cutoff switch
attached to the rider with a lanyard. OEM cutoff permitted in place of lanyard. Switch
must be on low-voltage side of the ignition circuit. Many stock machines are equipped
with a handlebar-mounted thumb switch that can have a lanyard easily attached for the
above purpose.
COMPUTERS
Only data gathering computers are allowed. No delay boxes or electronic throttle stops.
LIGHTS
Not necessary.
RIDER: 8
CREDENTIALS
Valid state- or government-issued driver’s license beyond a learner’s-permit level
mandatory for riders of motorcycles 10.00 (*6.40) or slower. See General Regulations
10:4 in NHRA Rulebook.
HELMET
Full coverage helmets only! Must be Snell-2005 or ECE 22.05 approved. Eye protection
required.
PROTECTIVE CLOTHING
Leather jacket, full-finger leather gloves and hi-top leather shoes or boots. Riders
exceeding 120 mph must wear full leathers.
8
SECTION 2: HOT STREET
Designation: "HS" followed by motorcycle number.
Reserved for Harley-Davidson Sportster, Buell, Big Twin and V-Rod motorcycles.
Motorcycle must be ridden under its own power to staging, starting line and back to the
pit area after completion of the run (no towing permitted). This is a heads up, .400second, Pro tree class.
REQUIREMENTS AND SPECIFICATIONS
ENGINE: 1
ENGINE
Must be Harley-Davidson based, air cooled, 45-degree XL, FX, FL or V-Rod 60 degree
water cooled V-Twin . Maximum displacement is limited to 114 cu.i. Engine case and
cylinder heads must be stock or Screamin’ Eagle castings only. Intake port, exhaust
port and stud locations must be the same dimension angles and locations as originally
cast. Only one (1) sparkplug is permitted for each cylinder. Internal modifications are
permitted. Compression releases are not permitted. A single oil return line may be
added to each cylinder head and routed directly to the crankcase. Engine must maintain
steel crankshaft and rods. Cylinders must be stock appearing. All engines must be
naturally aspirated and all air must be delivered through a single, float type carburetor
and a one-piece split runner manifold or through a Harley-Davidson or Screamin’ Eagle
fuel injection throttle body (no physical modifications are permitted to the throttle body).
EFI must have been factory installed. No portion of the intake or exhaust manifold may
extend past the mounting/sealing surface of the cylinder head. No fuel pumps are
permitted on carbureted engines. Crankcase and all tanks containing fluids must have
vent tubes routed to catch can or have a non-spill breather system on motorcycle.
Active crankcase evacuation systems are not permitted.
Engine Platform
Twin Cam-1*
Twin Cam-2
Evolution-1*
Evolution-1
Sportster-1*
Sportster-2
VRSC*
VRSC
Displacement (cu/in) Wheelbase (.in)
Max/114
Stock
Stock/107
68
Max/114
Stock
Stock/85
68
Max/99
Stock
Stock/76
68
Max 1250cc
Stock
Max 1130cc
Stock
(*) indicates must use stock length swing arm
Minimum Weight
725
675
700
None
675
625
675
675
***Riders weighing 200 lbs or more (suited), may deduct 15 lbs from min weight.***
Platform 1: Max displacement in OEM cases and unmodified OEM frame, using OEM
or Screamin’ Eagle cylinder heads
Platform 2: Max displacement in unmodified OEM cases with OEM stroke, using only
OEM or Screamin’ Eagle cylinder heads
9
FUEL
NHRA-accepted racing gasoline only. No Fuel additives and /or combustible oil
additives are permitted. Dielectric constant, as per NHRA testing meter, must match
baseline reading of specified fuel. Fuel must match color of specified fuel. Fuel must
match NHRA generated graphs in random Gas Chromatography analysis of specified
fuel. See General Regulations Section 1:6.
DRIVE TRAIN: 2
CHAIN GUARD
Must have chain or belt guard for primary and secondary drives.
TRANSMISSION
Stock or aftermarket castings are permitted. Transmission must be stock appearing.
Internal modifications are limited to back-cut, clearance and lightening operations.
Automatic transmissions are not permitted. No shifting devices are permitted other than
stock or aftermarket foot operated shift levers. Clutch must be stock type and spring
actuated. No weights, balls or levers (other than a hand operated clutch lever) may in
anyway enhance nor control the actuation or release of the clutch.
BRAKES AND SUSPENSION: 3
BRAKES
Front and rear mandatory (disc or drum).
CONTROLS
Handlebar controls must be located in safe, workable position. Foot pegs and foot
controls must be in the stock location. All controls must meet or exceed OEM equipment
standards. Snap-back throttle return mandatory.
SUSPENSION
Front suspension minimum size 30 mm and minimum travel of 2 inches. Travel limiting
straps are not permitted. Rear suspension may be strutted.
FRAME: 4
FRAME
Only stock, production, Harley-Davidson or Buell frames for licensed street motorcycles
are permitted. Modifications affecting the structural integrity are prohibited.
GROUND CLEARANCE
Minimum of 2 inches with rider on motorcycle and 10 PSI in the rear tire (includes
exhaust and kickstand).
WHEELBASE
Wheelbase: Maximum wheelbase is 68 inches. Wheelbase may be obtained by
lengthening the swing arm. Swing arm extensions will be inspected for quality of
workmanship and structural integrity.
WHEELIE BARS
Wheelie bars are not permitted.
10
TIRES AND WHEELS: 5
TIRES
Any entry running in excess of 120 MPH must use V rated tires, DOT motorcycle tires
only. No car tires are permitted. Tires must have 2/32” of tread on front and rear. The
tread radius of the tires, when viewed in cross section, shall not be greater than 12
inches.
WHEELS:
Stock OEM wheels or aftermarket performance wheels. Any size permitted.
SEAT: 6
SEAT
Stock OEM or seat with a step to prevent the rider from sliding backwards.
(Motorcycle must have a manufactured seat on it.)
BODY: 7
BODY
Stock OEM fenders and gas tank, or custom fenders and gas tanks are permitted but
must be mounted and constructed in a safe, craftsman-like manner. Rear fender must
cover the width of the rear tire and extend beyond the vertical centerline of the rear axle.
FAIRING
Permitted.
ELECTRICAL: 8
IGNITION
Any ignition system is permitted. No delay boxes, two steps or electronic throttle stops.
CONTROL SWITCHES
Must be mounted and constructed in a safe, craftsman-like manner. Motorcycles 10.99
(*6.99) seconds or quicker must be equipped with a positive ignition cutoff switch
attached to the rider with a lanyard. OEM cutoff permitted in place of lanyard. Switch
must be on low-voltage side of the ignition circuit. Many stock machines are equipped
with a handlebar-mounted thumb switch that can have a lanyard easily attached for the
above purpose.
CHARGING SYSTEM
Stock OEM charging system must be present and in working order.
LIGHTS
D.O.T. approved headlight (high and low beam), taillight and brake light must be
present and working properly.
STARTING SYSTEM
Electric or kick on board starters are required. No jump-starts from an external battery
are permitted in the staging lanes. No rollers. No push starts. No dry hops in pits.
11
SUPPORT GROUP: 9
COMPUTERS
Computers are not permitted. No electronic devices with the exception of a shift light are
permitted.
RIDER: 10
CREDENTIALS
Valid NHRA competition license mandatory for riders of all motorcycles running 9.99
(*6.39) or quicker. Valid state- or government-issued driver’s license beyond a learner’spermit level mandatory for riders of motorcycles 10.00 (*6.40) or slower. See General
Regulations 10:4 in NHRA Rulebook.
HELMET
Full-face Snell M2005, M2010, K2005, SA2005 or SA2010 helmet mandatory; shield
mandatory (goggles prohibited). See General Regulations 10:7 in NHRA Rulebook.
PROTECTIVE CLOTHING
Full all-leathers or SFI Spec 40.1/2 suit mandatory on motorcycles running 120 mph or
faster. Two-piece suits must be joined together with a metal 360-degree zipper at the
waist. SFI Spec 40.1/1 or 40.1/2 suit or leather jacket, leather boots/shoes above the
ankle, and leather gloves are mandatory on ALL motorcycles. Gloves must be Kevlarlined or equipped with slide buttons. See General Regulations 10:10 in NHRA
Rulebook.
12
SECTION 3: DRAGGIN’ BAGGER
Designation: "DB" followed by motorcycle number.
All production touring family motorcycles 1999 or later, Road King models permitted.
Motorcycle must be ridden under its own power to staging, starting line and back to the
pit area after completion of the run (no towing permitted except for verified breakage
after the conclusion of a run).
Minimum weight at conclusion of run, including rider and safety gear, must be 975
pounds.
REQUIREMENTS AND SPECIFICATIONS
ENGINE: 1
ENGINE
Minimum displacement 88 cubic inches. Maximum displacement is 120.5 cubic inches
with a stroke of 4.625 inches and a maximum bore of 4.070 inches. Camshaft profiles
are not restricted. All other engine upgrades are permitted utilizing engine components
available from Screamin’ Eagle Performance Parts only. No modifications are permitted
to any stock or upgraded engine components. All engines must be naturally aspirated
and all air must be delivered to the engine through a single, stock, OE or Screamin’
Eagle fuel injection throttle body. SE throttle bodies may be modified up to 64mm.
Maximum throttle plate diameter shall not exceed 64mm. EFI shall be controlled by an
OEM supplied ECM bearing the factory label. Air induction is limited to a single
concentric, continuous reducing diameter velocity stack with a maximum opening area
of 20 square inches and/or optional air filter. No cups or scoops are permitted. Fuel
shall be supplied by a maximum of two (2) stock, OE or Screamin’ Eagle supplied fuel
injectors. Compression releases are permitted. Crankcase vent tube must be routed to
catch can or carburetor air intake system.
FUEL
NHRA-accepted racing gasoline only. No Fuel additives and /or combustible oil
additives are permitted. Dielectric constant, as per NHRA testing meter, must match
baseline reading of specified fuel. Fuel must match color of specified fuel. Fuel must
match NHRA generated graphs in random Gas Chromatography analysis of specified
fuel. See General Regulations Section 1:6.
DRIVE TRAIN: 2
CHAIN GURAD
Must have OEM chain or belt guard for primary and secondary drives.
13
TRANSMISSION
Must be Harley-Davidson original equipment or Screamin’ Eagle supplied transmission.
Must be five (5) or six (6) speed OE or Screamin’ Eagle transmission. Clutch must be
cable or hydraulically operate by a handlebar mounted clutch lever only. Must have
OEM based clutch, modifications are permitted. No slipper clutches permitted. Belt
drives and chain drives are permitted. Final drives may consist of any ratios. Manually
operated air shifters and/or electric engine kills are permitted. No automatic
transmissions.
BRAKES AND SUSPENSION: 3
BRAKES
Entire braking system must be in good working order.
CONTROL
Handlebar controls must be located in safe, workable position. Foot controls shall be
located at the OEM location. All controls must meet or exceed OEM equipment
standards. Snap-back throttle return mandatory.
SUSPENSION
Front and rear must be stock OEM or Harley-Davidson P&A supplied performance
upgraded. No other modifications are permitted.
FRAME: 4
FRAME
Must be stock Harley-Davidson OEM frame. No structural modifications are permitted to
the frame. Must retain stock swing arm. All frame components must remain as supplied
by OEM.
GROUND CLEARANCE
Minimum of 2 inches with rider on motorcycle and 10 p.s.i. in rear
tire (includes exhaust and kickstand).
WHEELBASE
Must be factory wheelbase (allowing for chain/belt adjustment) for model of motorcycle
being entered in competition (maximum 66 inches, minimum 62 inches).
WHEELIE BARS
Wheelie bars are not permitted.
TIRES AND WHEELS: 5
TIRES
Must be H (or higher) rated/D.O.T. motorcycle tire. No car tires permitted. Must have
2/32 tread on front and rear. Any size. The tread radius of the tire, as viewed in cross
section, shall not be more than 12”.
14
SEAT: 6
SEAT
Stock OEM touring seat or Harley-Davidson P&A seat. No modifications to the seat are
permitted.
BODY: 7
BODY
Stock OEM front and rear fenders and gas tank are required. Stock OEM fiberglass
touring saddlebags and triangle side covers are required and must be located in their
factory position. No modifications are permitted to any bodywork or tank. Fairings are
required for models that had them as standard equipment and must be stock OEM
fairing with OEM or Harley-Davidson P&A windshield. No modifications are permitted.
Road King models are to use OEM or P&A windshield.
ELECTRICAL: 8
IGNITION
Must use same ECM as fuel injection for primary ignition control.
CHARGING SYSTEM
Not required
CONTROL SWITCHES
Must be mounted and constructed in a safe, craftsman-like manner. Motorcycles 10.99
(*6.99) seconds or quicker must be equipped with a positive ignition cutoff switch
attached to the rider with a lanyard. OEM cutoff permitted in place of lanyard. Switch
must be on low-voltage side of the ignition circuit. Many stock machines are equipped
with a handlebar-mounted thumb switch that can have a lanyard easily attached for the
above purpose.
LIGHTS
Not required
STARTING SYSTEM
Must be on board electrical starter of OEM configuration. No external starter, no push
starts, no rollers. No jump-starts from an external battery will be permitted in the staging
lanes.
SUPPORT GROUP: 9
COMPUTERS
Only data gathering computers are permitted.
15
RIDER: 10
CREDENTIALS
Valid NHRA competition license mandatory for riders of all motorcycles running 9.99
(*6.39) or quicker. Valid state- or government-issued driver’s license beyond a learner’spermit level mandatory for riders of motorcycles 10.00 (*6.40) or slower. See General
Regulations 10:4 in NHRA Rulebook.
HELMET
Full-face Snell M2005, M2010, K2005, SA2005 or SA2010 helmet mandatory; shield
mandatory (goggles prohibited). See General Regulations 10:7 in NHRA Rulebook.
PROTECTIVE CLOTHING
Full all-leathers or SFI Spec 40.1/2 suit mandatory on motorcycles running 120 mph or
faster. Two-piece suits must be joined together with a metal 360-degree zipper at the
waist. SFI Spec 40.1/1 or 40.1/2 suit or leather jacket, leather boots/shoes above the
ankle, and leather gloves are mandatory on ALL motorcycles. Gloves must be Kevlarlined or equipped with slide buttons. See General Regulations 10:10 in NHRA
Rulebook.
16
SECTION 4: STREET PRO
Designation: "SP" followed by motorcycle number.
Reserved for Sportster, Buell, Big Twin, Harley-Davidson V-Rod and aftermarket based
motorcycles. Motorcycle must be ridden under its own power to staging, starting line
and back to the pit area after completion of the run (no towing permitted except for
verified breakage after the conclusion of a run).
REQUIREMENTS AND SPECIFICATIONS
ENGINE: 1
ENGINE
Must be Harley-Davidson based 45 degree, air cooled XL, FX, aftermarket VTwin or
Harley-Davidson V-Rod 60 degree water cooled V-Twin. Maximum displacement is 145
cu.i.. All engines must be naturally aspirated and all air must be delivered to the engine
through a carburetor(s) or through a fuel injection throttle body. Closed loop EFI control
systems are permitted. Air induction is limited to concentric, continuous reducing
diameter velocity stack(s) with a maximum opening area of 20 square inches each. No
cups or scoops are permitted. Any other engine internal modifications are permitted. No
Finless Cylinders. Aftermarket heads are permitted. Lateral valve stem angle must be
zero degrees and minimum longitudinal valve stem angle is 18 degrees as measured
parallel from a vertical line centered in the respective cylinder bore. Crankcase vent
tube must be routed to catch can or carburetor air intake system.
FUEL
NHRA-accepted racing gasoline only. No Fuel additives and /or combustible oil
additives are permitted. Dielectric constant, as per NHRA testing meter, must match
baseline reading of specified fuel. Fuel must match color of specified fuel. Fuel must
match NHRA generated graphs in random Gas Chromatography analysis of specified
fuel. See General Regulations Section 1:6.
DRIVETRAIN: 2
CHAIN GUARD
Must have chain or belt guard for primary and secondary drives.
TRANSMISSION
Must be based transmission, modifications are permitted. Must have based clutch, any
modifications are permitted. Belt drives are permitted. Rear wheel drives may consist of
any ratios and materials. Manually operated air shifters or electric engine kills are
permitted. No automatic transmissions. No slipper clutches permitted.
BRAKES AND SUSPENSION: 3
BRAKES
Front and rear mandatory (disc or drum).
17
CONTROLS
Handlebar controls must be located in safe, workable position. Foot pegs and foot
controls shall be located within the perimeter of the frame cradle. All controls must meet
or exceed OEM equipment standards. Snap-back throttle return mandatory.
SUSPENSION
Front suspension minimum size 30 mm and minimum travel of 2 inches. Rear
suspension not required. Struts permitted.
FRAME: 4
FRAME
Stock Harley-Davidson OEM frame or aftermarket frame of which at least 25 of the
same design have been manufactured and are available to the general public.
Backbone may be raised to accept taller cylinders. Rake may be altered 3 degrees only.
Swing arm may be altered or changed. No specialized race frames. A frame-mounted
kickstand is required.
GROUND CLEARANCE
Minimum of 2 inches with rider on motorcycle and 10 p.s.i. in rear tire (includes exhaust
and kickstand).
WHEELBASE
70 inches maximum (measure center to center, front and rear axle), including chain
adjustment.
WHEELIE BARS
Wheelie bars are not permitted.
TIRES AND WHEELS: 5
TIRES
Must be V rated/D.O.T. motorcycle tire. No car tires permitted. Must have 2/32 tread on
front and rear. Any size permitted. The tread radius of the tire, as viewed in cross
section, shall not be more than 12”.
WHEELS
Stock OEM wheels or aftermarket performance wheels. Any size permitted.
SEAT: 6
SEAT
Stock OEM or seat with a step to prevent the rider from sliding backwards. (Motorcycle
must have a manufactured seat on it.)
BODY: 7
BODY
Stock OEM front and rear fenders and gas tank, or custom fenders and gas tanks are
permitted. Rear fender must cover the width of the rear tire and extend beyond the
vertical centerline of the rear axle.
18
FAIRING
Permitted
ELECTRICAL: 8
IGNITION
Any ignition system is permitted.
CHARGING SYSTEM
No charging system is required.
LIGHTS
D.O.T. approved light system. Hi-low beam, taillight and brakelight must work.
STARTING SYSTEM
Electric or kick. (No external starter, no push starts, no rollers. No jump starts from an
external battery will be permitted in the staging lanes.) Control Switches: Must be
mounted and constructed in a safe, craftsman-like manner. Motorcycles 10.99 (*6.99)
seconds or quicker must be equipped with a positive ignition cutoff switch attached to
the rider with a lanyard. OEM cutoff permitted in place of lanyard. Switch must be on
low-voltage side of the ignition circuit. Many stock machines are equipped with a
handlebar-mounted thumb switch that can have a lanyard easily attached for the above
purpose.
SUPPORT GROUP: 9
COMPUTERS
Only data gathering computers are permitted.
RIDER: 10
CREDENTIALS
Valid NHRA competition license mandatory for riders of all motorcycles running 9.99
(*6.39) or quicker. Valid state- or government-issued driver’s license beyond a learner’spermit level mandatory for riders of motorcycles 10.00 (*6.40) or slower. See General
Regulations 10:4 in NHRA Rulebook.
HELMET
Full-face Snell M2005, M2010, K2005, SA2005 or SA2010 helmet mandatory; shield
mandatory (goggles prohibited). See General Regulations 10:7 in NHRA Rulebook.
PROTECTIVE CLOTHING
Full all-leathers or SFI Spec 40.1/2 suit mandatory on motorcycles running 120 mph or
faster. Two-piece suits must be joined together with a metal 360-degree zipper at the
waist. SFI Spec 40.1/1 or 40.1/2 suit or leather jacket, leather boots/shoes above the
ankle, and leather gloves are mandatory on ALL motorcycles. Gloves must be Kevlarlined or equipped with slide buttons. See General Regulations 10:10 in NHRA
Rulebook.
19
SECTION 5: PRO GAS
Designation: "PG" followed by motorcycle number.
Reserved for alcohol or gas burning dragsters, built specifically for all out drag racing.
REQUIREMENTS AND SPECIFICATIONS
ENGINE: 1
ENGINE
Must keep design features of V-Twin engines (45° to 90° V-Twin). Aftermarket heads
are permitted, including 4 valve. Crankcase and all tanks containing fluids must have
vent tubes routed to catch can or have a spill breather system on motorcycle. Engine
restraint systems are recommended for nitrous engine. Chest protectors are
recommended. Scatter-shield or ballistic blanket required on superchargers.
UNLIMITED cu.i. - Gasoline or alcohol. Normally aspirated carburetor(s) or fuel injection
is permitted. No nitrous oxide or other supplemental fuels or oxidizers.
160 cu.i. - Gasoline or alcohol, single or double engines, carburetor or fuel injection.
Nitrous oxide OR supercharger OR turbocharger (any one of these).
122 cu.i. - Gasoline or alcohol, any induction system, nitrous oxide permitted.
DRIVE TRAIN: 2
CHAIN GUARD
Chain and belt guards are mandatory. Must cover top run of drive. Guard must be .060inch steel or 1/8 inch aluminum.
TRANSMISSION
Any type transmission may be used. Any type clutch, belt drives, air shift, etc. are
permitted. (Clutch must have strong protective covering.) Guard must be .060 steel or
1/8 inch aluminum. Transmissions and clutches must exhibit good engineering practices
and may require data to be submitted for approval.
BRAKES AND SUSPENSION: 3
BRAKES
Hydraulic type, front and rear, mandatory. Minimum size is 9-inch diameter, 1/8-inch
thickness for rotors.
CONTROLS
Handlebar controls must be located in safe, workable position. Foot pegs and foot
controls must be located in safe, workable position and must be mounted in a safe,
craftsman-like manner. Lanyard kill switch is mandatory.
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SUSPENSION
Front suspension minimum size 32 mm and minimum travel of 2 inches. Steering
dampeners are mandatory. Rear suspension not required.
FRAME: 4
FRAME
Aftermarket frames permitted. Steering head angle may not be less than stock rake. All
frame components, except braces, brackets and gussets, must be manufactured from
minimum 1.00 inch x 0.58 inch 4130 chrome moly tubing. All welding must be done by
approved heliarc process. All frames must have stops that limit turning arc to 28
degrees. Stop must have a sheer strength equal to a 3/8-inch bolt. All butt welds must
have visible reinforcement. Plating of frame prohibited. Painting permitted. Ground
Clearance: Minimum of 2 inches with rider on motorcycle and 10 p.s.i. in rear
tire (includes exhaust and kickstand). Wheelbase: Unlimited.
WHEELIE BARS
Wheelie bars are required. Minimum length from center of rear axle to center of Wheelie
bar axle must equal at least 70% of wheelbase.
TIRES AND WHEELS: 5
TIRES
Must be specified for racing use by manufacturer. 12-inch wide rear tire is maximum
limit. Wheels: Rear wheel minimum 15 inch, maximum 18 inch. Front wheel minimum
16 inch, maximum 19 inch.
SEAT: 6
SEAT
Seat: Seat, tail section and rear fender may be incorporated into one unit and must
include a step to prevent rider sliding backward.
BODY: 7
BODY
No body parts are required, except rear fender that must cover width of tire and extend
past the rear axle.
FAIRING
Permitted. Must be mounted solidly to frame tubes.
ELECTRICAL: 8
IGNITION
Any ignition system is permitted.
CHARGING SYSTEM
Not required.
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LIGHTS
Not required.
STARTING SYSTEM
Must be electric onboard or external starter. Battery top covers are required. No rollers.
No push starts. Jackstands are mandatory for starting motorcycles with slipper clutches.
No dry hops in pits.
CONTROL SWITCHES
Must be mounted and constructed in a safe, craftsman-like manner. Motorcycles 10.99
(*6.99) seconds or quicker must be equipped with a positive ignition cutoff switch
attached to the rider with a lanyard. OEM cutoff permitted in place of lanyard. Switch
must be on low-voltage side of the ignition circuit. Many stock machines are equipped
with a handlebar-mounted thumb switch that can have a lanyard easily attached for the
above purpose.
SUPPORT GROUP: 8
COMPUTERS
Only data gathering computers are permitted.
RIDER: 10
CREDENTIALS
Valid NHRA competition license mandatory for riders of all motorcycles running 9.99
(*6.39) or quicker. Valid state- or government-issued driver’s license beyond a learner’spermit level mandatory for riders of motorcycles 10.00 (*6.40) or slower. See General
Regulations 10:4 in NHRA Rulebook.
HELMET
Full-face Snell M2005, M2010, K2005, SA2005 or SA2010 helmet mandatory; shield
mandatory (goggles prohibited). See General Regulations 10:7 in NHRA Rulebook.
PROTECTIVE CLOTHING
Full all-leathers or SFI Spec 40.1/2 suit mandatory on motorcycles running 120 mph or
faster. Two-piece suits must be joined together with a metal 360-degree zipper at the
waist. SFI Spec 40.1/1 or 40.1/2 suit or leather jacket, leather boots/shoes above the
ankle, and leather gloves are mandatory on ALL motorcycles. Gloves must be Kevlarlined or equipped with slide buttons. See General Regulations 10:10 in NHRA
Rulebook.
RACE TEAM CLOTHING
All team crewman that help start, assist in burnout and stage race motorcycle must
wear a uniform shirt that relates to their specific team.
22
SECTION 6: PRO FUEL HARLEY
Designation: "PF" followed by motorcycle number.
Reserved for nitro burning, carbureted, high gear dragsters. Built specifically for all out
drag racing. Combined weight of motorcycle and rider at the conclusion of a run must
equal at least 5.7 pounds per cubic inch including safety gear.
REQUIREMENTS AND SPECIFICATIONS
ENGINE: 1
ENGINE
Must keep design features of Harley-Davidson engines (Pushrod, 45 V-Twin).
Carbureted single engine with 122 cu.i. maximum displacement. Fuel pumps are not
permitted. Pushrod aftermarket heads are permitted (including 4 valve). Crankcase and
all tanks containing fluids must have vent tubes routed to catch can or have a non-spill
breather system on motorcycle. Must have "Bellypan" scatter shield under engine. S.F.I.
Specification 46.1 approved engine restraint systems are required. These restraints
must be replaced or recertified by the manufacturer every two (2) years. Chest
protectors are mandatory.
FUEL
Fuel to be mononitromethane and/or methyl alcohol only. No propylene oxide or nitrous
permitted. Refer to General Regulations Section 1:6 of the current NHRA Rulebook for
nitromethane regulations.
DRIVETRAIN: 2
CHAIN GUARD
Chain and belt guards are mandatory. Must cover top run of drive. Guard must be .060inch steel or 1/8 inch aluminum.
TRANSMISSON
Not permitted. Single speed drive train only. Any centrifugal and/or RPM controlled
clutch may be used. The clutch must be self-contained. No fluid or electrical inputs may
control the operation of the clutch. (Clutch must have strong protective covering.) Guard
must be .060 steel or 1/8 inch aluminum, that cover the unit 360 degrees.
BRAKES AND SUSPENSION: 3
BRAKES
Hydraulic type, front and rear, mandatory. Minimum size is 9-inch diameter, 1/8-inch
thickness for rotors.
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CONTROLS
Handlebar controls must be located in safe, workable position. Foot pegs and foot
controls must be located in safe, workable position and must be mounted in a safe,
craftsman-like manner. Mandatory fuel shutoff must be accessible by rider from riding
position. A secondary shut-off device attached to rider (in the event of premature exit
from motorcycle) is recommended but not mandatory. Dual cable push-pull throttle
assembly is mandatory. Lanyard for secondary shut-off must be run through eyelet,
allowing the lanyard to be pulled in any direction and closing shut-off.
SUSPENSION
Front suspension minimum size 32 mm and minimum travel of 2 inches. Fork stops
required; must limit the turning arc to 28 degrees. Steering dampeners are mandatory.
Rear suspension not required.
FRAME: 4
FRAME
Any type permitted. All frames should be heliarc welded and main rails must have a
minimum diameter of one inch. All major frame tubing must be chrome moly and have
at least .058-inch wall thickness. Rake angle must be at least 35 degrees.
GROUND CLEARANCE
Minimum of 2 inches with rider on motorcycle and 10 p.s.i. in rear
tire (includes exhaust and kickstand).
WHEELBASE
Minimum of 75 inches.
WHEELIE BARS
Wheelie bars are required. Maximum length from center of rear axle to center of wheelie
bar axle must be at least equal the wheelbase but not exceed 120 inches. Must be
securely cross-braced.
TIRES AND WHEELS: 5
TIRES
Must be specified for racing use by manufacturer. Rear tire tread width is limited to 11
inches.
WHEELS
Rear wheel minimum 15 inch, maximum 18 inch. Front wheel minimum 16 inch,
maximum 19 inch.
SEAT: 6
Seat, tail section and rear fender may be incorporated into one unit and must include a
step to prevent rider sliding backward.
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BODY: 7
BODY
No body parts are required, except rear fender that must cover width of tire and extend
past the rear axle.
FAIRING
Permitted. Must be mounted solidly to frame tubes.
ELECTRICAL: 8
IGNITION
Any non-programmable capacitive OR inductive discharge ignition systems are
permitted. Hybrid (capacitive and inductive) ignitions are not permitted.
CHARGING SYSTEMS
Not required.
CONTROL SWITCHES
Must be mounted and constructed in an accepted manner. Motorcycles 10.99 (*6.99)
seconds or quicker must be equipped with a positive ignition cutoff switch attached to
the rider with a lanyard.
LIGHTS
Not required.
STARTING SYSTEMS
Must be electric external starter. Battery top covers are required. No rollers. No push
starts. Jackstands are mandatory for starting. No dry hops in pits.
SUPPORT GROUP: 9
COMPUTERS
Only data gathering computers are permitted.
RIDER: 10
CREDENTIALS
Valid NHRA competition license mandatory for riders of all motorcycles running 9.99
(*6.39) or quicker. Valid state- or government-issued driver’s license beyond a learner’spermit level mandatory for riders of motorcycles 10.00 (*6.40) or slower. See General
Regulations 10:4 in NHRA Rulebook.
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HELMET
Full-face Snell M2005, M2010, K2005, SA2005 or SA2010 helmet mandatory; shield
mandatory (goggles prohibited). See General Regulations 10:7 in NHRA Rulebook.
PROTECTIVE CLOTHING
Full all-leathers or SFI Spec 40.1/2 suit, leather boots that completely cover the ankle
with toe-area reinforcement, and full-finger leather gloves are mandatory. Gloves must
be Kevlar-lined or equipped with slide buttons and have knuckle armor and palm
reinforcement. Suits may be one-piece design or joined with a zipper at the waist.
Reinforcement and/or armor in the knee, elbow, shoulder, and knuckle areas required.
Spine/back protector and ballistic chest protector mandatory.
RACE TEAM CLOTHING
All team crewman that help start, assist in burnout and stage race motorcycle must
wear a uniform shirt that relates to their specific team.
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SECTION 7: TOP FUEL
Designation: "TF" followed by motorcycle number.
Reserved for nitro burning dragsters. Built specifically for all out drag racing.
REQUIREMENTS AND SPECIFICATIONS
ENGINE: 1
ENGINE
Must keep design features of Harley-Davidson engines (Pushrod, 45° to 90° VTwin).
Carbureted, fuel injected or supercharged single or double engines with 200 cu.i.
maximum displacement. Pushrod aftermarket heads are permitted (including 4 valve).
Crankcase and all tanks containing fluids must have vent tubes routed to catch can or
have a non-spill breather system on motorcycle. Superchargers must have rubber
manifold connections or some form of "sneeze" valve. Supercharger blankets are
mandatory. Must have "Bellypan" scatter shield under engine. S.F.I. Specification
46.1approved engine restraint systems are required. A nonflammable, oil absorbent
liner mandatory inside of retention device. These restraints must be replaced or
recertified by the manufacturer every two (2) years. Chest protectors are mandatory.
FUEL
Fuel to be mononitromethane and/or methyl alcohol only. No propylene oxide or nitrous
permitted. Refer to General Regulations Section 1:6 of the current NHRA Rulebook for
nitromethane regulations.
DRIVETRAIN: 2
CHAIN GUARD
Mandatory on all motorcycles. Chain guard must be .060-inch steel or 1/8-inch
aluminum and must be securely mounted in three places. Chain guard must cover the
width and at least the top run of the chain, from centerline to centerline of sprockets.
CLUTCH
Any type dry friction clutch, including multi-stage setup, permitted. Clutch engagement
must be by centrifugal force only and must exhibit reliable disengagement at idle speed.
Clutch must have a protective guard made of .060-inch steel or 1/8-inch aluminum that
covers the unit 360 degrees.
TRANSMISSION
Any transmission or high-gear-only system may be used.
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BRAKES AND SUSPENSION: 3
BRAKES
Hydraulic type, front and rear, mandatory. Minimum size for dual rotor is 9-inch
diameter, 1/8-inch thickness for rotors. Single rotor must be over 11-inch diameter.
CONTROLS
Handlebar controls must be located in safe, workable position. Foot pegs and foot
controls must be located in safe, workable position and must be mounted in a safe,
craftsman-like manner. Rider must be able to shut off fuel without removing hands from
handlebars. A secondary shut-off device attached to rider (in the event of premature exit
from motorcycle) must mechanically control the fuel shut-off valve. Lanyard for shut-off
must be run through an eyelet or guide, allowing the lanyard to be pulled in any
direction and closing shut-off. Dual cable push-pull throttle assembly is mandatory.
SUSPENSION
Front suspension minimum size 32 mm and minimum travel of 2 inches. A steering
dampener is mandatory. Rear suspension not required. Fork stops required; must limit
the turning arc to 28 degrees.
FRAME: 4
FRAME
Any type permitted. All frames should be heliarc welded and main rails must be chrome
moly and have a minimum diameter of 1-1/8 inch. All major frame tubing must have at
least .065-inch wall thickness. Rake angle must be at least 40 degrees. Alternative
frame materials must be submitted to NHRA for approval. Frames constructed before
1999 and approved for competition may use one (1) x .058 inch tubing.
GROUND CLEARANCE
Minimum of 2 inches with rider on motorcycle and 10 p.s.i. in rear tire (includes exhaust
and kickstand).
WHEELBASE
Minimum of 85 inches.
WHEELIE BARS
Wheelie bars are required. Minimum length from center of rear axle to center of wheelie
bar axle must be at least 84 inches but not exceed 120 inches. Must be securely crossbraced.
TIRES AND WHEELS: 5
TIRES
Must be specified for racing use by manufacturer. Any tire size is permitted
WHEELS
Rear wheel minimum 15 inch, maximum 18 inch. Front wheel minimum 16 inch,
maximum 19 inch.
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SEAT: 6
SEAT
Seat, tail section and rear fender may be incorporated into one unit and must include a
step to prevent rider sliding backward.
BODY: 7
BODY
No body parts are required, except rear fender that must cover width of tire and extend
past the rear axle.
FAIRING
Permitted. Must be mounted solidly to frame tubes.
ELECTRICAL: 8
IGNITON
Any ignition system is permitted.
CHARGING SYSTEM
Not required.
STARTING SYSTEM
Must be electric external starter. Battery top covers are required. No
rollers. No push starts. Jack stands are mandatory for starting. No dry hops in pits.
CONTROL SWITCHES
Must be mounted and constructed in an accepted manner. Must have an emergency
fuel shut off.
LIGHTS
Not required.
SUPPORT GROUP: 9
COMPUTER/DATA RECORDERS
Only data gathering computers are permitted.
RIDER: 10
CREDENTIALS
Valid NHRA competition license mandatory for riders of all motorcycles running 9.99
(*6.39) or quicker. Valid state- or government-issued driver’s license beyond a learner’spermit level mandatory for riders of motorcycles 10.00 (*6.40) or slower. See General
Regulations 10:4 in NHRA Rulebook.
HELMET
Full-face Snell M2005, M2010, K2005, SA2005 or SA2010 helmet mandatory; shield
mandatory (goggles prohibited). See General Regulations 10:7 in NHRA Rulebook.
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PROTECTIVE CLOTHING
Full all-leathers or SFI Spec 40.1/2 suit, leather boots that completely cover the ankle
with toe-area reinforcement, and full-finger leather gloves are mandatory. Gloves must
be Kevlar-lined or equipped with slide buttons and have knuckle armor and palm
reinforcement. Suits may be one-piece design or joined with a zipper at the waist.
Reinforcement and/or armor in the knee, elbow, shoulder, and knuckle areas required.
Spine/back protector and ballistic chest protector mandatory.
RACE TEAM CLOTHING
All team crewman that help start, assist in burnout and stage race motorcycle must
wear a uniform shirt that relates to their specific team.
30

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