Wiseco SK1203 69.25mm 2-Stroke Overbore Piston Kit for Polaris 440AC Indy Snowmobile

The Wiseco SK1203 is a 69.25mm overbore top-end piston kit designed for the Polaris 440AC Indy snowmobile (1984–1999). This kit provides everything needed for a complete top-end overbore or rebuild, including forged pistons, rings, wrist pins, circlips, and a top-end gasket set. Cross-reference part numbers: 2343M / 2727CD.

Key Features:

• Bore Size: 69.25mm (1.53mm overbore over standard)
• Pro-Lite forged pistons — CNC machined for optimal cam shape and profile for peak horsepower and service life
• Aerospace-grade alloy forgings for a superior strength-to-weight ratio
• Double-ring design for cast iron bore cylinders
• Includes forged piston(s), high-performance ring set, alloy wrist pin(s), and circlips
• Top-end gasket set included for a complete, one-stop rebuild
• Precision crafted and forged in the USA

Wiseco forged pistons outperform cast alternatives by offering denser grain structure aligned to the part geometry, resulting in higher mechanical strength and resistance to impact and fatigue — critical for the demands of 2-stroke snowmobile engines. The SK1203 kit is engineered specifically for 2-stroke applications and is offered in a quantity of one complete kit.