Snow and Grass Drag Stock Class Rules
This is only a summary of the rules. For complete rules see ISR rule book.
No modification allowed unless specifically allowed by ISR rules. If those rules do not spefically allow a change or modification, then it must be assumed that the change or modification is not allowed.
Drivers in stock classes must weigh a minimum of 180 pounds including protective gear. If the driver does not meet the weight requirement, ballast must be added to the snowmobile. Additional fuel may be used as ballast.
On snowmobiles with OEM fuel injection, commercially available electronic control modules may be added for the purpose of increasing or decreasing fule delivery only. The unit must plug directly into the OEM harness without modification.
Airbox may not be modified but may be removed. If removed, must be replaced by individual air cleaners.
Harmonic balancer may not be removed.
Any combination of springs, weights or ramps may be used in the primary and secondary clutches. No machining on clutches to accomodate springs or weights.
Aftermarket skis allowed but must be a minimum length of 40 inches.
Rear axle idler wheels must remain OEM for the model.
Traction devices (studs or picks) are not allowed.
Any commercially available one-piece molded rubber track of same length as OEM for the model track is allowed. Width may be different from OEM. No cutting of lugs or track width allowed. Modifications to install track are not allowed.
Windshield and windshield molding may be removed. No additional venting allowed. Headlight assembly may be removed (opening must be closed). Headlight consoles are not considered part of the headlight assembly.
Stock snowmibles will be allowed to add or remove tachometers, speedometers, or heat guages (openings must be closed).
Stock production snowmobiles equipped with a forced induction system from the factory will be run in a new specialty class "Open Stock". This class will also be open to all stock qualified snowmobiles.
No modification allowed unless specifically allowed by ISR rules. If those rules do not spefically allow a change or modification, then it must be assumed that the change or modification is not allowed.
Drivers in stock classes must weigh a minimum of 180 pounds including protective gear. If the driver does not meet the weight requirement, ballast must be added to the snowmobile. Additional fuel may be used as ballast.
On snowmobiles with OEM fuel injection, commercially available electronic control modules may be added for the purpose of increasing or decreasing fule delivery only. The unit must plug directly into the OEM harness without modification.
Airbox may not be modified but may be removed. If removed, must be replaced by individual air cleaners.
Harmonic balancer may not be removed.
Any combination of springs, weights or ramps may be used in the primary and secondary clutches. No machining on clutches to accomodate springs or weights.
Aftermarket skis allowed but must be a minimum length of 40 inches.
Rear axle idler wheels must remain OEM for the model.
Traction devices (studs or picks) are not allowed.
Any commercially available one-piece molded rubber track of same length as OEM for the model track is allowed. Width may be different from OEM. No cutting of lugs or track width allowed. Modifications to install track are not allowed.
Windshield and windshield molding may be removed. No additional venting allowed. Headlight assembly may be removed (opening must be closed). Headlight consoles are not considered part of the headlight assembly.
Stock snowmibles will be allowed to add or remove tachometers, speedometers, or heat guages (openings must be closed).
Stock production snowmobiles equipped with a forced induction system from the factory will be run in a new specialty class "Open Stock". This class will also be open to all stock qualified snowmobiles.
