Wiseco High-Compression Piston Kit, 3.031-Inch Bore for Yamaha YZ250F, YZ250FX and WR250F (RE812M07700)

The WISECO RE812M07700 piston kit is engineered for Yamaha YZ250F, YZ250FX and WR250F applications requiring improved power, torque and throttle response. Developed through research and development testing with dyno-proven performance gains, this high-compression piston features a 3.031-inch bore and a compression ratio of up to 14.5:1 for 250cc applications. The optimized dome design promotes efficient flame travel and more complete air/fuel combustion, helping maximize engine performance across the powerband.
The piston is manufactured from 100% billet material for an excellent strength-to-weight balance and precise fit. Its asymmetric skirt design supports improved wear characteristics and more even loading across the major thrust skirt. An ArmorGlide® skirt coating helps reduce friction, minimize operating noise and improve scuff resistance, while the DLC-coated piston pin further reduces friction and resists scuffing. Enhanced pin oiling improves lubrication for reliable operation under demanding riding conditions.
The WISECO RE812M07700 includes a precision-fit ring set with a custom-lapped compression ring, designed to help improve sealing, power and durability. A pressure seal groove helps reduce ring lift and associated power loss at high engine speeds. The complete kit includes the piston, rings, piston pin and circlips, providing the primary components needed for installation. Made in the USA, this WISECO piston kit is a performance-focused replacement for riders and builders seeking strong, responsive Yamaha four-stroke engine performance.

Features:

• Dyno-proven design supports improved power, torque and throttle response

• High compression ratio of up to 14.5:1 for 250cc applications

• 3.031-inch piston bore for compatible Yamaha engine applications

• Asymmetric skirt design promotes even loading and improved wear resistance

• 100% billet-machined construction provides strength, reduced weight and precise fit

• Optimized dome design improves flame travel and air/fuel burn efficiency

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

• Enhanced pin oiling supports improved lubrication and reduced friction

• Pressure seal groove helps reduce ring lift and power loss

• ArmorGlide® skirt coating reduces friction, operating noise and scuffing

• Precision-fit ring set includes a custom-lapped compression ring

• Kit includes piston, rings, piston pin and circlips

• Made in the USA

Ships from Parts Unlimited.