Wiseco PK1016 Top End Piston Kit Honda - 81.5mm 1985-1989 ATC/TRX350

The Wiseco PK1016 is a complete top end piston kit engineered for 1985–1989 Honda ATC350 and TRX350 applications. Featuring an 81.5mm bore diameter (4393M), this kit is built from aerospace-grade aluminum alloy using a dedicated forging process, delivering a superior strength-to-weight ratio compared to OEM cast pistons.

Wiseco pistons are CNC machined to tight tolerances, with an optimal cam shape and skirt profile designed for peak horsepower output and extended service life. Each piston is forged — not cast — making it significantly more resistant to heat and stress under demanding riding conditions.

Kit Includes:

• Forged piston — Aerospace alloy construction, race-proven design chosen by top race teams
• High-performance ring set — Engineered for extended life and sustained power delivery
• Alloy wrist pin — Precision machined for consistent fit and reduced friction
• Premium top end needle bearing — Highest quality materials for strength and longevity
• Wiseco top end gasket kit — Premium materials exceeding OEM sealing standards

Whether you are rebuilding a worn engine or upgrading for improved performance, the Wiseco PK1016 provides a complete, ready-to-install solution for Honda ATC350 and TRX350 engines. Wiseco's forged pistons are a trusted choice for off-road, trail, and ATV racing applications.