FSA Nationals- Lemoore Ca. 2stroke&4stroke

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FOUR STROKE ASSOCIATION – 300' Classes

 

 

Class 1) 0 - 505cc Limited, (OEM 450 based chassis) OEM frame/modified single cylinder 4 stroke motor on gas/oxy gas

 

Class 2) 506 - 550cc Limited, (OEM 450 based chassis) OEM frame/modified single cylinder 4 stroke motor on gas/oxy gas/methanol

 

Class 3) 551 - 650cc Limited, (OEM 450 based chassis) OEM frame/modified single cylinder 4 stroke motor on gas/oxy gas/methanol

 

Class 4) 0 - 650cc Unlimited, (OEM 450 based chassis) OEM frame/modified single cylinder 4 stroke power adder motor on nitro/nitrous/turbo/ super charger

 

Class 5) 650 - 735cc Limited, (OEM 650 based chassis) OEM frame/modified single cylinder 4 stroke motor on gas/oxy gas

 

Class 6) 736 - 825cc Limited, (OEM 650 based chassis) OEM frame/modified single cylinder 4 stroke motor on gas/oxy gas/methanol

 

Class 7) 826 - 1000cc Limited, (OEM 650 based chassis) OEM frame/modified single cylinder 4 stroke motor on gas/oxy gas/methanol

 

Class 8) 650 - 1000cc Unlimited, (OEM 650 based chassis) OEM frame/modified single cylinder 4 stroke power adder motor on nitro/nitrous/turbo/ super charger

 

Class 9) Limited Drag Chassis, (rigid frame/streched OEM chassis) after market chassis/modified single cylinder 2 or 4 stroke motor on gas/oxy gas/methanol

 

Class 10) Unlimited Drag Chassis, (rigid frame/streched OEM chassis) after market chassis/modified single cylinder 2 or 4 stroke power adder motor on nitro/nitrous/turbo/super charger

 

 

MODIFIED OEM MOTOR - Any internal modification to OEM motor designed to increase overall performance: porting, valves, valve springs, cams, piston, BB cylinder, stroker crank when allowed in specified classes. Override transmissions allowed in all classes.

 

CHASSIS - OEM frame required with double or single front A arms mounted in OEM position. Shocks replaced with struts are allowed. Rear OEM type swing arm of any length required. Light weight components can be bolted on such as extended swingarms, a-arms, subframe, etc.. No rigid extended front ends or rigid rear swing arm sections allowed. Sub frames, foot pegs must be bolted on, not welded. Frame can be cut to remove unwanted tabs/tubes, but tubes cannot be replaced. Any additional tabs that require welding MUST be approved prior by FSA or the chassis will be deemed illegal for competition. Any relocation of steering stem, radiator, oil tank, battery, etc., MUST be approved by FSA prior or chassis will be deemed illegal. OEM plastic hood piece and tank cover mounted in original position is mandatory. Wheely bars allowed in all classes.

 

• Definition of OEM Chassis

* Original Chassis with all mounts and equipment in the OEM position except for the following modifications only:

Frame straps across the front of TRX450R.

Relocation of radiator (must be approved by FSA prior)

Relocation of oil resevoir tank (must be approved by FSA prior)

Battery relocation within frame.

Removal of cable hangers and other brackets not used.

No geometry changes.

No tube replacement.

Smoothing of welds for cosmetic purposes only.

 

 

 

2 Stroke Classes

Class 11) 350 Modified (stock frame stock cases stock cylinders)

 

Class 12) 0-550 Limited

 

Class 13) 0-550 Unlimited

 

Class 14) 551-750 Limited

 

Class 15) 551-750 Unlimited

 

Class 16) Super Twin 750 and up Limited

 

Class 17) Super Twin 750 and up Unlimited

 

Class 18) Triple Limited

 

Class 19) Triple Unlimited

 

Class 20) Open Outlaw

 

 

 

FSA SxS Classes

 

Class 21) Limited SxS OEM Class - Any modified OEM motor (big bore/stroker included) on gas or race gas in OEM chassis, no cc cap. Example: Yamaha Rhino OEM chassis with OEM Rhino motor.

 

Class 22) Limited SxS OEM Power Adder - Any modified OEM motor with N2O, turbo, or super charger. Example: Razor OEM chassis with OEM Razor motor turbo charged.

 

Class 23) Unlimited SxS Class - Any after market modified motor on gas, alcohol, nitro, N2O, turbo, super charger or any combination of all. Example: Weber NA motor, Weber motor with turbo/N2O.