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2003 Rules:Fuels will be limited to only petroleum
based fuels. No nitro based fuels, No super or turbo charging
Supersport 50cc
Tires:NO SLICKS ALLOWED
Chassis:no frame mods, stock swingarm no
bracing, aftermarket swing arm bushings, shock,fork spring, &
fork brace are allowed. Front Fork Assy must be O.E.M.
Brakes:Aftermarket Brake pads and steel
braided lines allowed. Master cylinder and caliper must be stock
Engine:Must be stock YSR engine, no porting,
no head work, no cylinder or crank stuffing, no piston mods allowed.Ignition
timing must be stock, no lightened flywheels. Oversize piston
are allowed up to 1.0mm overbore
Airbox and Carb:Carb must be stock and retain a
16mm bore, jetting may be altered for variation in atmospheric
conditions, pipe changes and airbox changes. Airbox may be drilled
with a maximum of 12 one inch holes, 9.42 square inches max
Pipes:Any and all pipes are allowed.
Must have silencer and be reasonably quiet
Superbike 50cc
Tires:NO SLICKS ALLOWED
Chassis:no frame mods, stock swingarm with
bracing, aftermarket swing arm bushings, shock,fork spring,fork
brace & top clamp are allowed. Front Fork Assy must be O.E.M.,
aftermarket rims (12") are allowed, stock wheelbase must
be retained
Brakes:Open
Engine:Same as supersport with these exceptions;
Cylinder and head are open to all mods, no aftermarket ignitions,
no lightened flywheels, ignition timing may be altered
Pipes:Same as supersport
Airbox and Carb:Any carb not to exceed a 24mm bore
size. air filter open
GP50cc
Tires:open-no knobbies
Chassis:Same as Superbike plus swingarms
are open. Open to any 50cc motorcyle, (MB5, NS50, NSR50, TZR50,
Aprilia RS50, Derbi GP50,) Rim size is open
Brakes:Open
Engine:Engine mods are open with a limit
of 64cc 2 stroke, 100cc 4 stroke, ignitions are open
Pipes:Same as supersport
Airbox and Carb: Open, no fuel injection
GP80cc
Tires:open-no knobbies
Chassis:Open, home made or heavily mod
frames must be constructed and/or mod by use of sound standard
practices and show quality craftsmanship. To be scrutinized by
the Chief Tech Inspector. Rim size is open
Engine:Open, 2 strokes limited to 92cc,
and 4 strokes 100cc
Airbox and Carb:
Open |
