Wiseco SK1281 Pro-Lite Top End Piston Kit 70.50mm Bore Polaris 500 2-Stroke Twin

The Wiseco SK1281 is a complete top end rebuild kit engineered specifically for the Polaris 500cc Liberty twin-cylinder 2-stroke engine. Featuring a standard 70.50mm (2.776 in.) bore, this kit is a direct OEM-spec replacement designed for stock rebuilds without requiring additional machining or cylinder modification.

What's Included:

• 2x forged Pro-Lite aluminum pistons
• 2x piston ring sets (Wiseco rings — not interchangeable with other brands)
• Wrist pins with floating pin design (0.787 in. diameter)
• Circlips
• Complete top end gasket set

Key Features:

• USA-made forged construction — engineered, forged, and CNC-machined in Mentor, OH
• High-silicon forged aluminum — greater strength and lower thermal expansion at high operating temperatures
• Pro-Lite design — CNC-machined for optimal cam shape and profile, maximizing horsepower and service life
• Optimized strength-to-weight ratio — dedicated forgings with lightening operations reduce reciprocating mass without sacrificing durability
• Improved tensile strength — forged grain structure aligned to part geometry resists impact and fatigue far better than cast alternatives
• 64.00mm stroke compatibility

Wiseco's Pro-Lite 2-stroke pistons are the result of over 80 years of piston manufacturing experience dating back to 1941. Every piston is designed and built for each specific powersports engine, making the SK1281 a trusted choice for Polaris 500 Indy snowmobile top end rebuilds. Note: Top end bearings are not included. Wiseco rings are not interchangeable with other brands and must only be used with Wiseco pistons.