STOCK 600cc Engine

​MUST HAVE SERIAL # ON ENGINE


a.)  Terms and conditions

1)  If a change or modification to the stock engine or its parts is not included in these rules then the modification is considered illegal.

2)  The word “Stock” means unmodified factory original parts or components. Any 600cc 4 cylinder 4 stroke as comes on a stock production bike for public sale in the U.S.A. No current year production engines.


No Nitrous, turbo or superchargers permitted.


No porting/polishing or metal removal of any kind.

No Factory ported engines

Must have STOCK COMPRESSION


Must use stock production throttle body that came with that year,make and model. Do not have to use "Stock Air Box"

Modification of oil pan & pick up allowed or aftermarket ok. 
Modification to thermostat cover allowed or aftermarket ok. 
Modification to water pump cover allowed or aftermarket ok. 
Any air box, ECU must be same year, model as manufacture, aftermarket washable replacement air filter, power commander on fuel injection models only W/O Traction Control

For engine safety you will be allowed aftermarket chain tensioners 


Weight Rule: Stock 600 - 750 lbs., including driver, at the conclusion of the race. Any weight must be painted white with your #. Loss of any bolt-on weight during competition will disqualify the individual from that event.


No in-cockpit adjustments of any kind, if a panard adjustment is not removeable because of mounts it must be bolted with ny-locks nuts, no zip ties


Tires: (BONE STOCK) Open Tire rule; No prep


Must have STOCK on roll bar with contracting color on both sides for Scale personnel


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600A Engines 

​MUST HAVE SERIAL # ON ENGINE


Any 600cc 4 cylinder 4 stroke as comes on a stock production bike for public sale in the U.S.A. No current year production engines.


Engines must be stock with stock unaltered parts for that year, make, and model of engine only.

No Nitrous, turbo or superchargers permitted.

No porting/polishing or metal removal of any kind. No Factory ported engines.

No removal of any metal from engine or head allowed other than a valve job.

Engines must be stock bore and stroke for that year, make, and model engine.

No aftermarket internal parts allowed with the exception of rod bolts and cam sprockets.

Aftermarket injection ok. NO MECHANICAL INJECTION.

Aftermarket cam chain tensioners, thermostat covers, water pump covers, aftermarket oil pans, and engine oil pickups are allowed.

Any air box, ECU must be same year, model as manufacture, aftermarket washable replacement air filter, power commander on fuel injection models only W/O Traction Control.


Stock ECU boxes modified for the use of methanol only.

Charging systems must be hooked up, working, and unaltered.

All cars must have a cockpit operated electric starter and an onboard battery capable of starting the engine.

All cars must be chain driven off of the original countershaft. 



Weight Rule: 600A - 775 lbs., including driver, at the conclusion of the race. Any weight must be painted white with your #. Loss of any bolt-on weight during competition will disqualify the individual from that event. 

No in-cockpit adjustments of any kind if a panard adjustment is not removeable because of mounts it must be bolted with ny-locks nuts, no zip ties


Tires: 600A any brand must punch 45 RR (no tolerance) No Prep


Must have 600A on roll bar with contracting color on both sides for Scale personnel



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OUTLAW

MUST HAVE SERIAL # ON ENGINE

640cc MAX displacement. No Nitrous, turbo or superchargers permitted. NO Traction Control


Weight Rule: Outlaw - 820 lbs. , including driver, at the conclusion of the race. Any weight must be painted white with your #. Loss of any bolt-on weight during competition will disqualify the individual from that event. (this weight can be adjusted if needed)

No in-cockpit adjustments
of any kind, if a panard adjustment is not removeable because of mounts it must be bolted with ny-locks nuts, no zip ties

Tires: 
Outlaw Max Width 12.0".....Punch 53+ after speaking to manufactures 


Must have Outlaw on roll bar with contracting color on both sides for Scale personnel



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Fuel Tanks:

Fuel tanks must be carried on the centerline of the chassis and must be mounted behind the driver. For driveshaft driven cars, a conventional midget style tail tank and bladder meeting SFI specification 28.2 is required. Maximum capacity for fuel tanks of this design is twenty-seven (27) gallons. For chain driven cars, fuel tank meeting SFI specification 28.1 is required. This tank must not protrude beyond the rear most cross member of the chassis. Maximum capacity for fuel tanks of this design is five (5) gallons. Cars utilizing this style tank must use a tail tank cover resembling a traditional midget style tail.

There will be no minimum capacity of the fuel tank. All fuel tanks must have a minimum of four mounts to the chassis. Fuel tanks may not be mounted to the chassis utilizing any portion of the access plates or the nut plates bonded into the fuel bladder. A protective cover may be used on the top of the tail tank providing it is no more than 9 inches in height, 12 inches in length and not wider than the top (head rest) of the tank.


Wheelbase:

Must be between 58" to 65" maximum


The SSMS reserves the right to ALTER/TWEAK any rule for sake of competition 



2020-2023

600 Engine rules