Wiseco SK1161 Top End Kit 1.00mm Oversize 73.00mm Bore Polaris Storm 800

The Wiseco SK1161 is a complete top end kit designed for overboring or rebuilding the 800cc Fuji engine found in the Polaris Indy Storm snowmobile. This kit delivers everything needed for a full top end rebuild in one convenient package, built to Wiseco's high-performance standards.

Kit Includes:

• Forged piston(s) – manufactured from high-silicon bar stock for superior strength and reduced thermal expansion at high operating temperatures
• Wiseco performance rings – precision-matched to the forged piston (Wiseco rings are not interchangeable with other brands and must only be used with Wiseco pistons)
• Wrist pins – high-alloy pins included for extended service life
• Circlips – retaining clips for proper wrist pin retention
• Top end gasket set – all necessary gaskets and O-rings for a complete top end seal

Key Specifications:

• Bore Size: 73.00mm (+1.00mm oversize)
• Engine Type: Fuji 800cc two-stroke
• Piston Material: Forged aluminum (2-cycle high-silicon bar stock)
• Series: XPS (Xtreme Performance Standard)

Important Notes:

• Cylinder sleeves must be purchased separately
• 1996–1998 Polaris Storm models feature a Nikasil bore cylinder – sleeving or cylinder replating is required before installing this oversize piston kit
• 1994–1995 Polaris Storm models do not require Nikasil treatment but should be professionally bored to the correct oversize before installation

Wiseco's XPS top end kits are engineered for the performance demands of snowmobile engines, offering a direct upgrade path over stock components with tighter tolerances and superior materials. All components in the SK1161 kit are matched and tested for compatibility, ensuring a reliable rebuild.