Wiseco CK201 4-Stroke Forged Piston Kit 81.00mm Big Bore Domed

The Wiseco CK201 is a 4-Stroke Forged Series complete top end piston kit featuring an 81.00mm bore with a domed piston design engineered for the Yamaha XS650. With a total displacement of 775cc, this kit is purpose-built as a big bore oversize solution, requiring cylinder resleeving (compatible with Wiseco sleeve part number 3066FA).

Wiseco's forged 4-stroke pistons are designed for each specific engine application and manufactured to tight tolerances, delivering an optimized balance of performance and durability. The aerospace-grade forged aluminum construction offers superior tensile strength and a better strength-to-weight ratio compared to cast alternatives — making these pistons better suited to handle the demands of high-performance applications.

Kit Includes:

• Forged aluminum domed piston — aerospace alloy with dome designed for improved flame travel
• High-quality piston ring set
• 20mm floating wrist pin
• Circlips
• Top end gasket set

Key Specifications:

• Bore: 81.00mm (3.189 in.)
• Stroke: 74.00mm
• Total Displacement: 775cc
• Wrist Pin: 20mm floating
• Piston Style: Domed (2VP)
• Piston Material: Forged aluminum
• Oversize: +1.00mm
• Resleeving Required: Yes (Wiseco sleeve PN: 3066FA)

Engineered, forged, and machined in the USA, this Wiseco kit provides the reliable foundation needed for a proper top end rebuild or big bore conversion.