Potter County Trail Busters Inc.

Subtitle

                                                                           Vintage Class Rules

 

 

All classes - Any production leaf spring snowmobile.  Any track, any skis, any clutches, any carbs, any suspension for a production snowmobile.  No exotic (expensive!) aftermarket racing parts allowed.  Must have hood, belly pan, and seat in all classes except open.  Track must fit within tunnel.  No forced induction (turbos, NOS, etc.).  .060" max. overbore in all classes except open.  Gasoline only.  Snow/mud flaps required.  Tethers and clutch/belt guards required.  Shielded stands required.

 Class 1: 

 a.  Engines 340cc and under, fan or free air, with a single carb and a single, stock, quiet exhaust, 160# compression  max.

 b.  Single cylinder engines any cc with any exhaust, no compression limit.

       No factory race/mod sleds.

 Class 2:

  a.  Fan cooled engines 341cc or more with a single carb and a single, stock, quiet exhaust, 160# compression max.                                                          

  b.Fan cooled engines 340cc and under with either single or twin carbs, and/or single or twin exhaust, no compression limit.                                                                

  c. Fan cooled factory race/mod sleds 340cc and under.

 Class 3:

a. Free air twin cylinder engines over 341 cc with twin carbs and a single, stock quiet exhaust, 160psi compression max.                                                              

b.Free air engines 340cc and under with either single or twin carbs and/or single or twin exhaust, no compression limit.                                                                       

c. Fan cooled engines over 341cc with either single or twin carbs and/or single or twin exhaust, no compression limit.                

 d. Factory race/mod sleds with fan cooled engines any cc.                                       

 e. Factory race/mod sleds with free air engines 340cc and under.

 Class 4:

 a. Liquid cooled engines any cc, must have the complete, original, factory stock, quiet exhaust, 160psi compression max.                                                             

 b. Free air twin or triple cylinder engines over 341 cc, with multiple exhaust, no compression limit.                                                                                                      

 c. Factory race/mod sleds with free air engines any cc.                                       

 d. Factory race/mod sleds with liquid cooled engines 340cc and under.

 Class 5: 

Open class.  Any sled that doesn’t fit the above classes can run open.  Open class sleds must use a vintage (leaf spring) engine. 

 Factory race sleds = Sno-Twisters, Thunderjets, Zs, Starfires, Blizzards, etc.

Rules are subject to change.  In extreme cases a sled may be re-classed for a better fit overall – race directors discretion.  Any questions, please ask, don’t assume.  Our number one goal is keep the racing fair and fun for everybody!