Wiseco Piston Kit 81mm Bore 10.25:1 Compression for 1985-1986 Honda ATC350X PK1015

If you're running a 1985-1986 Honda ATC350X, factory pistons are a limiting factor in reliability and peak performance—especially if you're pushing RPMs or operating in sustained high-temperature conditions. The Wiseco Piston Kit PK1015 replaces compromised stock components with high-silicone forged pistons engineered to handle the demands of serious riding. This complete top-end kit arrives with everything needed for installation, eliminating the hassle of sourcing individual components and ensuring proper fitment with OEM-spec ring clearances.

Wiseco's forged construction minimizes thermal expansion under load, which means tighter tolerances, better ring seal, and more efficient combustion across a wider RPM band. The 10.25:1 compression ratio and 81mm bore deliver measurable gains in throttle response without requiring engine modifications. Installation is straightforward for experienced mechanics—this is a bolt-on upgrade that pays dividends in durability and rideability.

• 81mm bore diameter
• 10.25:1 compression ratio
• High-silicone forged material
• Complete kit included
• Pistons, rings, wrist pins
• Circlips and gasket set
• Optimized for 2-cycle engines
• Precision Wiseco ring fit
• High-temperature rated
• Honda ATC/TRX350 fitment
• 1985-1986 model years