Wiseco R637 Forged Piston Kit for Honda CR250F / CR500F

The Wiseco R637 is a complete forged piston kit designed for Honda F2/F3 applications. Each kit includes pistons, rings, circlips, and wrist pin, giving you everything needed for a quality rebuild in one package.

Key Features:

• Forged Aluminum Construction: Manufactured from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives.
• CNC Diamond-Turned Finish: Precision machined on computer-controlled turning centers to guarantee consistent sizing and a perfect surface finish with zero size variation from piston to piston.
• Universal Cylinder Compatibility: Engineered to install confidently in all modern cylinder bore compositions, including cast iron, chrome, Nikasil, and boron composite cylinders.
• Oversize Availability: Available in a wide range of oversizes to restore worn cast iron cylinders to factory tolerances, and compatible with resleeved chrome, Nikasil, and boron composite cylinders.
• Complete Kit: Includes piston(s), rings, circlips, and wrist pin (wrist pin included except where noted).

Wiseco forged pistons are built to meet the demands of both high-performance racing and everyday recreational riding. The R637 piston kit is a direct-fit solution that delivers OEM-quality dimensions with the added durability of forged construction — ideal for engine rebuilds, bore jobs, or performance upgrades.