Wiseco High-Compression Piston Kit, 77.00 mm for Yamaha YZ250F, YZ250FX and WR250F (RE802M07700)

Upgrade your Yamaha performance with the WISECO RE802M07700 piston kit, engineered through research and development for dyno-proven power gains and responsive engine performance. Designed for select Yamaha YZ250F, YZ250FX and WR250F applications, this high-compression piston helps increase torque and throttle response. The dome profile promotes efficient flame travel for improved air and fuel combustion, while the precision-fit ring package includes a custom-lapped compression ring to support power production and dependable sealing.
The WISECO RE802M07700 piston is fully billet machined for an optimized fit and an excellent strength-to-weight ratio. Its asymmetric skirt design improves wear characteristics and distributes loading more evenly across the major thrust skirt. An ArmorGlide® skirt coating helps reduce friction, supports quieter operation and improves resistance to scuffing. The pressure seal groove helps minimize ring lifting and power loss under demanding operating conditions.
Additional performance features include a DLC-coated piston pin that reduces friction and improves scuff resistance, along with enhanced pin oiling for better lubrication. The kit includes the piston, rings, piston pin and circlips for a complete installation package. High-compression ratios are application-specific, including 14:1 for 450cc models and 14.5:1 for 250cc models; verify engine application and required specifications before installation. Made in the USA, the WISECO RE802M07700 delivers carefully engineered piston technology for riders seeking durable, precise and performance-focused internal engine components.

Features:

• Dyno-proven design developed to provide power gains and responsive engine performance

• 77.00 mm high-compression piston for select Yamaha YZ250F, YZ250FX and WR250F applications

• Asymmetric skirt design improves wear characteristics and distributes loading evenly across the major thrust skirt

• Precision-fit ring package with custom-lapped compression ring supports improved power and sealing

• 100% billet-machined construction provides an optimized fit and excellent strength-to-weight ratio

• High-compression design improves torque and throttle response

• Dome profile promotes efficient flame travel and air/fuel combustion

• DLC-coated piston pin reduces friction and improves scuff resistance

• Enhanced pin oiling supports lubrication and helps reduce friction

• Pressure seal groove helps reduce ring lifting and power loss

• ArmorGlide® skirt coating reduces friction, supports quieter operation and improves scuff resistance

• Kit includes piston, rings, piston pin and circlips

• Made in the USA

Ships from Parts Unlimited.