Wiseco PK1865 High Compression 4-Stroke Piston Kit 96mm 13.4:1 CR ArmorGlide

The Wiseco PK1865 is a high-compression forged 4-stroke piston kit featuring a 96.00mm bore and 13.4:1 compression ratio, purpose-built for demanding ATV performance applications. Engineered, forged, and machined in the USA at Wiseco's facility in Mentor, OH, this kit delivers the strength and precision that serious riders demand.

The piston is forged from high-silicon, low-expansion aluminum, offering superior strength, reduced weight, improved heat transfer, and longer service life compared to cast alternatives. Wiseco's dedicated forging process aligns the grain structure of the alloy to the features of the part, producing higher mechanical properties and outstanding resistance to impact and fatigue—critical qualities for high-compression, race-ready applications.

Key Features:

• 96.00mm bore with 13.4:1 high compression ratio for maximum power output
• ArmorGlide skirt coating reduces friction and piston rock, contributing to increased horsepower and improved ring seal
• Forged from high-silicon, low-expansion aluminum for superior strength-to-weight ratio
• CNC diamond-turned finish ensures precise sizing with no variation
• Engineered, forged, and machined in the USA
• Includes high-performance ring set, alloy wrist pin, and circlips
• Complete top-end gasket kit included for a full rebuild
• Designed using 3D modeling and finite element analysis for optimized strength and weight

Wiseco's ArmorGlide skirt coating is the result of extensive in-house dyno development, delivering a tighter piston-to-bore fit for a better ring seal, reduced piston rock noise, and minimized friction for sustained power gains. This kit includes everything needed for a complete top-end rebuild. Piston forging number: 4974M09600.