CLASS 1: PRE-1951; 0-250CC; 2-STROKE OR 4-STROKE
NO BRAKES IN OVAL COMPETITION. BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70X7.0X19-INCH OR 4:00X19-INCH MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM SPOKE TYPE RIMS ONLY. NO MAG TYPE RIMS
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM SPOKE TYPE RIMS ONLY. NO MAG TYPE RIMS
FORKS
LIKE MAKE AND MODEL. NO ADJUSTABLE TRIPLE CLAMPS.
GAS TANK
ERA CORRECT
FRAME
OEM. ERA CORRECT STIFFENING ALLOWED
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. MUST MATCH FRAME AND FORKS. LIKE, MAKE AND MODEL
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL BORE AND STROKE MAY BE CHANGED 250CC
MAX
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT. MAGNETOS CAN BE USED, BUT MUST BE HIDDEN IN ORIGINAL IGNITION HOUSINGS
CARBURETOR
OEM OR LINKERT M&S SERIES, AMAL TYPE 29, 76, 276, TT, RN. NO MIKUNI.
RESTRICTORS
NONE
TRANSMISSION
OEM LIKE MAKE AND MODEL. 4 SPEED MAX NO FOOT OR HAND SHIFT
CONVERSIONS ON BIKES ORIGINALLY HAND SHIFT. NO HAND CLUTCH CONVERSION.
SHOCKS
RIGID REAR SUSPENSION ONLY
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM, LIKE MAKE AND MODEL. DRUM ONLY
BRAKES REAR
OEM, LIKE MAKE AND MODEL. DRUM ONLY
CLASS 2: PRE-1951; 750CC SIDE VALVE OR 500CC OVERHEAD VALVE; 4-STROKE ONLY
NO BRAKES IN OVAL COMPETITION. BRAKES IN TT RACING ONLY. 80-CI LIMIT IN TT RACING ONLY.
FRONT TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM SPOKE TYPE ONLY. NO MAG TYPE RIMS
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM. SPOKE TYPE ONLY. NO MAG TYPE RIMS
FORKS
LIKE MAKE AND MODEL. NO ADJUSTABLE TRIPLE CLAMPS.
GAS TANK
ERA CORRECT
FRAME
OEM. ERA CORRECT STIFFENING ALLOWED
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. MUST MATCH FRAME AND FORKS. LIKE, MAKE AND MODEL
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT. CDI MAY BE USED, BUT MUST BE HIDDEN IN ORIGINAL IGNITION
HOUSING
CARBURETOR
ERA CORRECT OEM OR LINKERT M&S SERIES, AMAL TYPE 29,76,276 TT, RN. NO
MIKUNI.
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 4 SPEED MAX. NO FOOT SHIFT OR HAND CLUTCH CONVERSIONS ON BIKES ORIGINALLY HAND SHIFT. NO MILITARY HAND CLUTCH CONVERSIONS
SHOCKS
RIGID REAR SUSPENSION ONLY
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM, LIKE MAKE AND MODEL DRUM ONLY
BRAKES REAR
OEM, LIKE MAKE AND MODEL, MECHANICAL DRUM ONLY
CLASS 3: 1952-1968; 251CC-750CC 4-STROKE SIDE VALVE; 251CC-500CC 2-STROKE OR OVERHEAD VALVE 4-STROKE
NO BRAKES IN OVAL COMPETITION. BRAKES IN TT RACING ONLY. 900CC
MAXIMUM DISPLACEMENT IN TT RACING ONLY.
FRONT TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM SPOKE TYPE ONLY. NO MAG TYPE RIMS
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM SPOKE TYPE ONLY. NO MAG TYPE RIMS
FORKS
35MM MAX DIA. CONVENTIONAL DESIGN ONLY. NO ADJUSTABLE TRIPLE CLAMPS.
GAS TANK
ERA CORRECT
FRAME
OEM TWIN SHOCK OR RIGID. AFTERMARKET RIGID FRAMES ONLY.
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
OEM OR ERA CORRECT. CDI MAY BE USED BUT MUST BE HIDDEN IN ORIGINAL
IGNITION LOCATION
CARBURETOR
OEM OR LINKERT M, L&S, TILLOTSEN, DEL'ORTO SSI, AMAL MONOBLOC AND CONCENTRIC, GP, TT, IRZ 32MM. MIKUNI FLANGE MOUNT ONLY; NO VM MIKUNI OR MIKUNI/KEIHIN FLAT SLIDES ALLOWED.
RESTRICTORS
NO REED VALVES
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 5 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. NO PIGGY BACK SHOCKS
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM.
BRAKES REAR
OEM.
CLASS 4: 1952-1968; 0-250CC; 2-STROKE OR 4-STROKE
NO BRAKES IN OVAL COMPETITION. BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM. SPOKE TYPE ONLY. NO MAG TYPE RIMS
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM. SPOKE TYPE ONLY. NO MAG TYPE RIMS
FORKS
35MM MAX DIA. CONVENTIONAL DESIGN ONLY. NO ADJUSTABLE TRIPLE CLAMPS.
GAS TANK
ERA CORRECT
FRAME
OEM TWIN SHOCK OR RIGID. AFTERMARKET RIGID FRAMES ONLY.
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT CDI MAY BE USED, BUT MUST BE HIDDEN IN ORIGINAL IGNITION
LOCATION
CARBURETOR
ERA CORRECT 32MM MAXIMUM SINGLES 28MM TWINS. LINKERT M,L&S TILLOTSEN, DEL 'ORTO SSI, AMAL MONOBLOC, CONCENTRIC,GP AND TT. IRZ 32MM. MIKUNI FLANGE MOUNT ONLY; NO VM MIKUNI OR MIKUNI/KEIHIN FLAT SLIDES ALLOWED.
RESTRICTORS
NO REED VALVES
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 6 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. NO PIGGY BACK SHOCKS
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM
BRAKES REAR
OEM
CLASS 5: 1969-1976; 175CC-250CC; 2-STROKE 0R 4-STROKE; 2-STROKE SINGLES ONLY; 4-STROKE SINGLES AND TWINS ALLOWED
REAR BRAKES MANDATORY. NO FRONT BRAKES IN OVAL COMPETITION. FRONT BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM. MAG OR SPOKE TYPE ALLOWED
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM. MAG OR SPOKE TYPE ALLOWED
FORKS
FORKS OEM OR ERA CORRECT. 35MM MAX DIAMETER. CONVENTIONAL DESIGN ONLY. NO ADJUSTABLE TRIPLE CLAMPS. AFTERMARKET FIXED ALUMINUM TRIPLE CLAMPS ARE ALLOWED.
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET. TWIN SHOCK ONLY
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT. CDI MAY BE USED, BUT MUST BE HIDDEN IN ORIGINAL IGNITION LOCATION
CARBURETOR
ERA CORRECT. NO MM LIMIT. NO MIKUNI OR KEIHIN FLAT SLIDES
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 6 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. NO PIGGY BACK SHOCKS
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM OR ERA CORRECT DISC, TWO PISTON MAX.
BRAKES REAR
OEM OR ERA CORRECT DISC, TWO PISTON MAX
CLASS 6: 1969-1976; 251CC-360CC; 2-STROKE OR 4-STROKE; 250CC TWINS ALLOWED
REAR BRAKES MANDATORY. NO FRONT BRAKES IN OVAL COMPETITION. FRONT BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70 X 7.0 X 19 OR 4:00X19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE RIMS
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE RIMS
FORKS
FORKS OEM OR ERA CORRECT. 35MM MAX DIAMETER. CONVENTIONAL DESIGN ONLY. NO ADJUSTABLE TRIPLE CLAMPS. AFTERMARKET FIXED ALUMINUM TRIPLE CLAMPS ARE ALLOWED.
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET TWIN SHOCK ONLY
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT. CDI MAY BE USED, BUT MUST BE HIDDEN IN ORIGINAL IGNITION LOCATION
CARBURETOR
ERA CORRECT. NO MM LIMIT. NO MIKUNI OR KEIHIN FLAT SLIDES
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 6 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. NO PIGGY BACK SHOCKS
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM OR ERA CORRECT DISC. 2 PISTON MAX
BRAKES REAR
OEM OR ERA CORRECT DISC. 2 PISTONS MAX
CLASS 7: 1969-1976; 361CC-500CC; SINGLES; 2-STROKE OR 4-STROKE
REAR BRAKES MANDATORY. NO FRONT BRAKES IN OVAL COMPETITION. FRONT BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70 X 7.0 X 19 OR 4:00 X 19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE
FORKS
FORKS OEM OR ERA CORRECT. 35MM MAX DIAMETER. CONVENTIONAL DESIGN ONLY. NO ADJUSTABLE TRIPLE CLAMPS. AFTERMARKET FIXED ALUMINUM TRIPLE CLAMPS ARE ALLOWED.
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET. TWIN SHOCK ONLY
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT. CDI ALLOWED, BUT MUST BE HIDDEN IN ORIGINAL IGNITION LOCATION
CARBURETOR
ERA CORRECT. NO MM LIMIT. NO MIKUNI OR KEIHIN FLAT SLIDES.
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 5 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. NO PIGGY BACK SHOCKS
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM OR ERA CORRECT DISC, 2 PISTON MAX
BRAKES REAR
OEM OR ERA CORRECT DISC, 2 PISTON MAX
CLASS 8: 1969-1976; 335CC-750CC MULTI-CYLINDER; 2-STROKE OR 4 STROKE
REAR BRAKES MANDATORY. NO FRONT BRAKES IN OVAL COMPETITION. FRONT BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70 X 7.0 X 19 OR 4:00 X 19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE
FORKS
FORKS OEM OR ERA CORRECT. 35MM MAX DIAMETER. CONVENTIONAL DESIGN ONLY. NO ADJUSTABLE TRIPLE CLAMPS. AFTERMARKET FIXED ALUMINUM
TRIPLE CLAMPS ARE ALLOWED.
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET. TWIN SHOCK ONLY
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION. NO 1989 OR LATER XR 750 PARTS ALLOWED.
HEAD
OEM, LIKE, MAKE AND MODEL NO 'D' PORT HEAD ON XR 750. SINGLE PLUG ONLY
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL. NO BIG OIL PUMP ON XR 750. 1988 OR OLDER OIL PUMP ONLY
IGNITION
ERA CORRECT. NO MOTOPLAT OR PVL ON XR750.
CARBURETOR
ERA CORRECT. NO MM LIMIT. NO MIKUNI OR KEIHIN FLAT SLIDES
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 5 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. NO PIGGY BACK SHOCKS
EXHAUST
ERA CORRECT
BRAKES FRONT
OEM OR ERA CORRECT DISC, 2 PISTON MAX
BRAKES REAR
OEM OR ERA CORRECT DISC, 2 PISTON MAX
CLASS 9: 1977-1988; 250CC 2-STROKE; 504CC 4-STROKE; SINGLES ONLY
REAR BRAKES MANDATORY. NO FRONT BRAKES IN OVAL COMPETITION. FRONT BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70 X 7.0 X 19 OR 4:00 X 19 MAXIMUM
FRONT RIM
WM-6 3.50 MAXIMUM. SPOKE OR MAG TYPE RIM
REAR TIRE
2.75X7.5X19 MAXIMUM
REAR RIM
WM-6 3.50 MAXIMUM. SPOKE OR MAG TYPE RIM
FORKS
OEM OR ERA CORRECT. ANY DIAMETER, CONVENTIONAL DESIGN ONLY. ADJUSTABLE TRIPLE CLAMPS ALLOWED.
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET TWIN SHOCK OR ROBERTS MONO SHOCK, EARLY C&J MONO SHOCK (HORIZONTAL SHOCK ON TOP OF MOTOR) HONDA FACTORY DIRT TRACK, RS LINKAGE FRAME OR PANTHER-BOLGER LINKAGE FRAME
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT
CARBURETOR
ERA CORRECT
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 5 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. PIGGY BACKS ALLOWED. NO REMOTE RESERVOIRS
EXHAUST
ERA CORRECT 115 DECIBEL LIMIT
BRAKES FRONT
OEM OR ERA CORRECT DISC, MULTI PISTON ALLOWED
BRAKES REAR
OEM OR ERA CORRECT DISC, MULTI PISTON ALLOWED
CLASS 10: 1977-1988; 375CC-500CC 2-STROKE SINGLES; 505CC-600CC 4-STROKE SINGLES; 501CC-750CC RESTRICTED TWINS
REAR BRAKES MANDATORY. NO FRONT BRAKES IN OVAL COMPETITION. FRONT BRAKES IN TT RACING ONLY.
FRONT TIRE
2.70 X 7.0 X 19 OR 4:00 X 19 MAXIMUM
FRONT RIM
WM-6 3.50 MAXIMUM. SPOKE OR MAG TYPE ALLOWED
REAR TIRE
2.75X7.5X19 MAXIMUM
REAR RIM
WM-6 3.50 MAXIMUM. SPOKE OR MAG TYPE ALLOWED
FORKS
OEM OR ERA CORRECT. ANY DIAMETER, CONVENTIONAL DESIGN ONLY. ADJUSTABLE TRIPLE CLAMPS ALLOWED.
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET TWIN SHOCK OR ROBERTS MONO SHOCK, EARLY C&J MONO SHOCK (HORIZONTAL SHOCK ON TOP OF MOTOR) HONDA FACTORY DIRT TRACK, RS LINKAGE FRAME OR PANTHER-BOLGER LINKAGE FRAME
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION. NO 1989 OR LATER XR 750 PARTS ALLOWED.
HEAD
OEM, LIKE, MAKE AND MODEL NO 'D' PORT HEAD ON XR 750. SINGLE PLUG ONLY
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL. 1988 OR OLDER CASES ON XR750. NO BIG OIL PUMP ON XR 750. 1988 OR OLDER OIL PUMP ONLY.
IGNITION
ERA CORRECT NO MOTOPLAT OR PVL ON XR750'S
CARBURETORS
SINGLES, UN-RESTRICTED. TWINS, EITHER 34MM CARBS MAX WITH NO
RESTRICTORS
RESTRICTORS OR 38MM OR LARGER CARBS WITH 33MM INTAKE RESTRICTORS.
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 5 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. PIGGY BACKS ALLOWED. NO REMOTE RESERVOIRS
EXHAUST
ERA CORRECT 115 DECIBEL LIMIT
BRAKES FRONT
OEM OR ERA CORRECT DISC, MULTI PISTON ALLOWED
BRAKES REAR
OEM OR ERA CORRECT DISC, MULTI PISTON ALLOWED
CLASS 11: YOUTH; 1969-1976; 0-125CC; 2-STROKE OR 4-STROKE; SINGLES OR TWINS
REAR BRAKES MANDATORY IN ALL OVAL COMPETITION. FRONT BRAKES ALLOWED IN TT RACING ONLY.
FRONT TIRE
2.70X7.0X19 OR 4.00X19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM. SPOKE TYPE ONLY. NO MAG TYPE RIMS
REAR TIRE
4.00X18 DIAMETER MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM
FORKS
OEM OR ERA CORRECT. 35MM MAX DIA. CONVENTIONAL DESIGN ONLY. NO ADJUSTABLE TRIPLE CLAMPS.
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET. TWIN SHOCK ONLY
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE, MAKE AND MODEL
CYLINDER
OEM, LIKE, MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT. CDI ALLOWED, BUT MUST BE HIDDEN IN ORIGINAL IGNITION LOCATION
CARBURETOR
ERA CORRECT 34MM SINGLES, 30MM TWINS. NO FLAT SLIDES
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 6 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. NO PIGGY BACK SHOCKS
EXHAUST
ERA CORRECT
BRAKES FRONT
ERA CORRECT DISC. 2 PISTON MAX
BRAKES REAR
ERA CORRECT DISC. 2 PISTON MAX
CLASS 12: YOUTH; 1977-1988; 0-125CC; 2-STROKE OR 4 STROKE
REAR BRAKES ONLY IN OVAL COMPETITION. FRONT BRAKES ALLOWED IN TT RACING ONLY.
FRONT TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
FRONT RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE RIMS.
REAR TIRE
2.70X7.0X19 OR 4:00X19 MAXIMUM
REAR RIM
WM-3 2.15 MAXIMUM. SPOKE OR MAG TYPE RIMS ALLOWED
FORKS
OEM OR ERA CORRECT. ANY DIAMETER CONVENTIONAL DESIGN ONLY
GAS TANK
ERA CORRECT
FRAME
OEM, STIFFENING ALLOWED OR ERA CORRECT AFTERMARKET TWIN SHOCK ONLY MFG. MONO SHOCK OR LINKAGE FRAME ALLOWED
SEAT
ERA CORRECT
OIL TANK
ERA CORRECT
MOTOR
MFG. APPROVED FOR COMPETITION
HEAD
OEM, LIKE MAKE AND MODEL
CYLINDER
OEM, LIKE MAKE AND MODEL .080 OVERBORE AND MFG STROKE
CASES
OEM, LIKE MAKE AND MODEL
IGNITION
ERA CORRECT
CARBURETOR
ERA CORRECT 34MM MAX FLAT SLIDES ALLOWED
RESTRICTORS
NONE
TRANSMISSION
OEM, LIKE MAKE AND MODEL. 6 SPEED MAX.
SHOCKS
OEM OR ERA CORRECT. PIGGY BACKS ALLOWED. NO REMOTE RESERVOIRS
EXHAUST
ERA CORRECT
BRAKES FRONT
ERA CORRECT DISC. 2 PISTON MAX
BRAKES REAR
ERA CORRECT DISC. 2 PISTON MAX
CLASS 13: WOMAN'S OPEN, ALL ELIGIBLE MACHINERY FROM 1969-1988
THIS CLASS IF FOR WOMEN FROM AGE 18 AND UP. THEY CAN COMPETE ON ANY DISPLACEMENT MACHINES IN THE ABOVE CATEGORIES. ALL VINTAGE RULES APPLY.
CLASS 14: 50-PLUS OPEN, ALL ELIGIBLE MACHINERY FROM 1969-1988
THIS CLASS IS FOR COMPETITORS THAT ARE 50 YEARS OF AGE OR OLDER ON THE DATE OF THE RACE. THEY CAN COMPETE ON ANY DISPLACEMENT MACHINES IN THE ABOVE CATEGORIES. ALL VINTAGE RULES APPLY.