Wiseco 4312M07050 Forged Piston Kit 70.50mm Bore .020 Over 10.25:1 CR ATV

The Wiseco 4312M07050 is a 4-stroke forged piston kit featuring a 70.50mm bore (.020" oversize) and a 10.25:1 compression ratio, purpose-built for ATV applications. Engineered, forged, and machined in the USA at Wiseco's facility in Mentor, OH, this piston kit delivers the strength and precision demanded by both performance riders and recreational enthusiasts.

Wiseco's forged aluminum construction provides a significant advantage over cast alternatives. Forged pistons feature condensed, aligned grain structure that results in higher mechanical properties and superior resistance to impact and fatigue — critical qualities for the high-stress environment inside a powersports engine.

Key Features:

• 70.50mm bore diameter — .020" oversize for engines requiring first overbore
• 10.25:1 compression ratio for optimized power output
• Forged aluminum alloy construction — improved tensile strength, strength-to-weight ratio, and service life vs. cast pistons
• Dedicated forging designed specifically for this engine application and built to tight tolerances
• Complete kit — includes high-quality piston rings, wrist pin, and circlips; ready to install
• Engineered and manufactured entirely in the USA (Mentor, OH)
• Only Wiseco replacement ring sets should be used on Wiseco pistons

Whether you're rebuilding a worn engine or upgrading to a stronger bottom end, the Wiseco 4312M07050 piston kit provides a factory-quality fit with performance-grade materials. Cross-reference: 060243.