AMA Vintage Dirt Track Classes

Old Dirt Never Hurt

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.