Brand New Standard Bore Top End Rebuild Kit.


  • Includes a new 72mm stock bore Wiseco piston kit (piston,rings,wrist pin,circlips).
  • Includes a Tusk top end gasket kit.
  • Includes a Heavy Duty wrist pin bearing.
  • Wiseco Pistons are forged from high silicon, low expansion aluminum which offers superior strength, reduced weight, improved heat transfer, and longer life.
  • Compatible with all OEM components.

Fits: 1988-1990 Polaris Trail Boss 250


**All returns must be in original condition, new and unused (just like it was received). A restocking fee (of up to 20%) may apply.**