2018 ADRL NITRO PRO FUEL TOUR RULES
Nitro Pro Fuel (NPF) 1/4 Mile
DESIGNATION: NPF, followed by rider 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 720lbs.
Must keep design features of Harley-Davidson engines (Pushrod, 45 V-Twin).
Carbureted single engine with 125 cu.i. maximum displacement. Pushrod
aftermarket heads are legal (including 4 valve). Crankcase and all tanks
containing fluids must have vent tubes routed to catch can or have a nonspill
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 can be re-certified an unlimited amount of
times as long as the strap is in good condition. No lean outs behind the
butterfly of the carburetor. Example: no extra butterflies, no airlines going
into the heads or manifolds behind the carburetor.
Fuel to be mononitromethane and/or methyl alcohol only. No propylene
oxide or nitrous allowed.
Chain and belt guards are mandatory. Must cover top run of drive. Guard
must be .060-inch steel or 1/8 inch aluminum.
Not allowed! 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.
Hydraulic type, front and rear, mandatory. Minimum size is 9-inch diameter,
1/8-inch thickness for rotors.
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.
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 necessary.
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. Alternative frame materials must be submitted to
AHDRA for approval. Ground Clearance: Minimum of 2 inches with rider on
motorcycle and 10 p.s.i. in rear tire (includes exhaust and kickstand).
Minimum of 75 inches.
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.
Must be specified for racing use by manufacturer. Rear tire tread width is
limited to 11 inches as measured by AHDRA template.
Rear wheel minimum 15 inch, maximum 18 inch. Front wheel minimum 16
inch, maximum 19 inch.
No body parts are necessary, except rear fender that must cover width of
tire and extend past the rear axle.
Are legal. Must be mounted solidly to frame tubes.
Seat, tail section and rear fender may be incorporated into one unit and
must include a step to prevent rider sliding backward.
Any programmable capacitive OR inductive discharge ignition systems are
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.
Must be mounted and constructed in a safe, craftsman-like manner. Must
have an emergency kill switch.
Only data gathering computers are allowed.
Full coverage helmets only! Must be Snell-2000 or ECE 22.05 approved. Eye
Full finger leather gloves with knuckle armor and palm reinforcement, one
piece or full circumference zippered leather suit with knee, elbow and
shoulder armor or reinforcement, spine/back protector and above the ankle
leather boots with toe area reinforcement are required.
Chest protectors are mandatory. “Ballistic chest protection” (meaning bullet
proof) is a device worn to protect the rider’s chest from puncture of flying
debris in case of catastrophic engine explosion.
All motorcycles must be teched in before participation. Motorcycle, rider and his protective gear must be present at tech area. Tech official will have final say on any unclear rule or equipment. At anytime during the event a tech official can come look and check the bike to make sure it meets the rule
CREDENTIALS: Valid NHRA completion license mandatory.
RF SHTUDOWN RECEIVER: Properly functioning Electrimotion shutoff device (part numbers SB001 and RF001) recommended.