Note: Featured Image credit: Larry Lawrence/ photo

Next Gen Superbike Lightweight

( For further information, contact John Turner at or Brian Wells at )

Mission Statement and Intent

To provide a lightweight class to showcase what was raced in the ’80s through the early ’90s.  This will be a world market class based off an index of performance.  If a motorcycle is proven to be demonstrably faster than the competition, it can be mechanically limited or bumped to another class immediately.

Four stroke machines can bump to Next Gen Superbike, two strokes can bump to Open Two stroke.

This class will be limited to period modifications.

Approved Motorcycles

1988 Bimota YB7 400cc
1985-1987 Cagiva Alazzurra 650cc
1980-1984 Ducati TT2 597cc
1979-1983 Ducati Pantah 500cc, 600cc and 650cc
1989-1992 Honda VFR400 through NC30
1989-1994 Honda CBR400 NC23 and NC29
1988-1990 Honda CB-1
1988-1991 Honda Hawk NT650
1983-1985 Honda VF500F
1987-1993 Honda NSR250 MC18 and MC21
1988-1992 Kawasaki KR1 and KR1S
1987-1993 Kawasaki EX500

1985-1989 Suzuki GSXR400 pre upside down forks
1989-1997 Suzuki GSF400 Bandit
1988-2000 Suzuki GS500E/F
1989-1993 Suzuki RGV250 VJ21
1986-1988 Yamaha FZ600
1986 Yamaha SRX600
1985-1990 Yamaha TZR250 3MA
1988-1994 Yamaha FZR400 1WG and 3TJ
1983-1985 Yamaha RZ350
1980-1983 Yamaha RD250/350LC
1973-1985 Yamaha TZ250/350 pre Deltabox

Requirements and Modifications For Next Gen Superbike Lightweight

  1. General
    1. Engine, frame and bodywork must be from the same make and model, see section “C” chassis and frame.
    2. AHRMA’s “like design” rule does not apply. Exceptions will be written in the rules.
    3. All street equipment must be removed.
    4. All motorcycles are to use 3 white number plates/backgrounds of approx. 10”x12”, with one on the front center of the fairing and one on each side of the rear tail section, behind the rider. Number plates/backgrounds shall not be placed anywhere else on the motorcycle. Numerals shall be black, at least 7” tall, block style, without serifs, with a stroke width of one inch and legible. See section 9.5 for additional requirements.
    5. Competitor must comply with all applicable parts of sections 1-9 of the AHRMA handbook.
    6. All work and modifications must be performed to a high standard of fit, finish, and workmanship.
    7. 250cc 2-stroke GP replica machines (TZR, NSR, RGV, etc..), are limited to Supersport modifications, see 9.8.1.
    8. Eligible machines in this class can be from any market in the world.
  2. Engine
    1. All machines must retain stock stroke. Bore may be increased to 2.0mm over.
    2. Engines must be from the same make and model as the frame. All manufacturer engines should be period correct. Engine parts may be updated only if they are directly interchangeable and have no performance advantage. The Yamaha RZ must use OE cylinders. No aftermarket Banshee cylinders allowed. Yamaha RZ may use “cool head”.
    3. The use of race type crankcase covers or welded/braced OEM covers is allowed and encouraged, for safety purposes.
    4. Bikes must use fuel delivery type as fitted from the factory. OEM carburetors may be replaced with any style or carb size.
    5. Motorcycles must be naturally aspirated.
    6. Airbox modifications allowed for all machines except GP replica machines as mentioned above in General. See A.7.
    7. Motorcycles must have period style exhaust. All exhaust systems must be equipped with an effective silencer; open pipes or open megaphones are not allowed. See rule 9.3.h.
    8. No electronic traction control, wheelie control or telemetry allowed. Quick shifters and lap timers are allowed.
  3. Chassis and Frame
    1. Frame and engine must be from the same model with the following exceptions: Yamaha TZ250 and TZ350’s can use steel replacement frames. Examples are, Harris, Spondon, Seely, Nico Baker, Rob North etc. No aftermarket aluminum chassis are allowed.
    2. Frames may be braced and strengthened to period modifications only. Brackets and tabs for street equipment may be removed. Frames may be polished, painted, or coated. Subframes may be modified or altered.
    3. Period swingarm conversions are allowed. Swingarms used in conversions must be pre 1992 model year. Bracing is allowed using round or rectangle aluminum or steel tubing only. Bracing may not be “sheeted” or enclosed. Period aftermarket swingarms are allowed. In the case of the aftermarket frames listed in C.1, if a swingarm is not part of the aftermarket frame the stock swingarm from that motorcycle must be used.
    4. Rear shock(s) may be replaced or modified but cannot be repositioned. Suspension rockers, linkage etc. may be replaced or modified.
    5. Forks may be replaced with other period units. Forks must be of the conventional right side up type.
    6. No restrictions on wheel size, although period-appropriate appearance is strongly encouraged. Carbon fiber wheels are not allowed.
    7. Rotors must be conventional steel. Petal rotors are prohibited. Perimeter brakes allowed if they were OEM.
    8. Calipers must be axial style.
    9. No restrictions on tires; slicks, DOT, or rain tires are allowed. Tire warmers may be used.
  4. Bodywork
    1. Fuel tank and bodywork must be OEM or accurate street or race replicas. Material construction of bodywork and tank is unrestricted. Bodywork design must be of the period. Bodywork for motorcycles that do not have OEM full fairings are limited to bodywork used prior to 1992.
    2. Rear fender maybe removed.
    3. Oil retention belly pan must be used on all machines. (see rule 9.3.f)
    4. Machines will not pass tech with unpainted bodywork, bodywork in primer or bodywork that is damaged.
    5. Period OEM and Race Team paint schemes are strongly encouraged.