Wiseco 431P6 ATV Piston Kit .060 Over Bore Forged

The Wiseco 431P6 is a forged ATV piston kit machined to a .060" (1.524mm) oversize bore, designed for engines that have been bored beyond the standard dimension during a top-end rebuild. Built to Wiseco's exacting tolerances, this piston delivers the strength and dimensional accuracy required for reliable ATV engine performance.

Key Features:

• Forged aluminum construction — high-silicon, low-expansion alloy provides superior strength, reduced weight, and improved heat transfer compared to cast alternatives
• .060" oversize bore — engineered for cylinders bored 1.524mm over standard to restore proper piston-to-wall clearance
• CNC diamond-turned finish — precision machining ensures consistent sizing and optimal surface finish for proper ring seating
• Compatible with all cylinder bore compositions — suitable for cast iron, chrome, Nikasil, and boron composite cylinder linings
• Complete kit — includes piston, ring set, wrist pin, and circlips; everything needed for a single-cylinder top-end rebuild
• Wiseco-exclusive ring sets required — only Wiseco replacement ring sets are designed and approved for use with Wiseco pistons

Wiseco has been manufacturing performance forged pistons since 1941 and remains the only aftermarket piston brand in the United States that produces pistons exclusively through the forging process. Each piston is engineered and machined at Wiseco's facility in Mentor, Ohio, and proven across all levels of ATV and off-road riding.