Wiseco 2310M07225 Piston Kit Yamaha 72.25mm +0.25mm Oversize 489cc 2-Cylinder

The Wiseco 2310M07225 is a high-performance forged piston kit designed for Yamaha twin-cylinder engines with a 489cc displacement. Machined to a 72.25mm actual bore diameter (0.25mm oversize over the standard 72.00mm bore), this kit is ideal for engine rebuilds requiring a first oversize bore.

Key Features:

• Dedicated aerospace-alloy forging — superior strength-to-weight ratio for high-stress performance applications
• CNC machined cam profile — optimized skirt geometry for peak horsepower and extended service life
• Precision-ground bore — 72.25mm actual diameter (+0.25mm oversize) for a cast iron bore, fan-cooled application
• High-performance ring set (2844CD) — engineered for sustained power output and reduced blow-by
• Pro-Lite design — lightweight construction without sacrificing durability
• 18mm wristpin (S257) — unchromed, high-alloy pin for consistent trueness and reduced friction
• Round wire circlips (CW18) — 18mm pair included for secure pin retention
• Race-proven designs trusted by top-level race teams across multiple motorsport disciplines

Kit Contents (2-Cylinder Set):

• 2 Pistons (one per cylinder)
• 2 Ring sets — 2844CD 72.25mm
• 2 Wristpins — S257 18mm x 2.2047" unchromed
• 2 Pairs of circlips — CW18 round wire 18mm

Specifications:

• Standard Bore: 72.00mm
• Actual Bore: 72.25mm
• Oversize: +0.25mm
• Stroke: 59.60mm
• Displacement: 489cc
• Cylinders Covered: 2
• Pin Diameter: 18mm
• Application Notes: Pro-Lite, Cast Iron Bore, Fan Cooled

Note: Top-end bearings, gaskets, and cylinder sleeves are not included. This kit covers both cylinders of a twin-cylinder application. Always confirm your standard bore size and required oversize before ordering to ensure correct fitment.