AMA Racing has announced the class structure for AMA-sanctioned vintage dirt-track events. The below classes will be run at all AMA-sanctioned dirt-track meets, such as the dirt-track program at the AMA Racing Vintage Grand Championships and other AMA-sanctioned vintage dirt track events and series.

All classes are designed to be historically accurate across all eras of dirt-track competition. For technical questions about these classes, competitors should contact AMA Racing Dirt Track Manager Ken Saillant at (614) 856-1900, ext. 1260.

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.