Wiseco 4767M08700 High-Compression Forged Piston Kit CR - 87mm 12 1

The Wiseco 4767M08700 is a high-performance forged piston kit engineered for the Yamaha XT500, TT500, and SR500 (1976–1981). Featuring a 12:1 compression ratio and an 87.00mm bore, this kit is purpose-built for riders looking to extract maximum power from their classic Yamaha single-cylinder four-stroke engine.

Key Features:

• Forged from aerospace-grade aluminum — the forging process compresses the material's molecules, increasing density and aligning grain flow for superior impact resistance, fatigue resistance, and tensile strength
• 12:1 high-compression ratio — delivers increased horsepower and torque over stock compression pistons
• 87.00mm standard bore diameter — precision machined to tight tolerances for optimal fit and performance
• Application-specific design — engineered and machined specifically for the Yamaha XT500/TT500/SR500 engine
• Optimized piston skirt profile — minimizes cylinder wall friction for improved throttle response and reduced wear
• Complete kit — includes piston, piston rings, wrist pin, and circlips; everything needed for a full piston replacement
• Engineered, forged, and machined in the USA — manufactured at Wiseco's facility in Mentor, OH

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively using the forging process, ensuring each unit meets the demands of high-performance and racing applications. The 3425XC forging code identifies the specific forging used for this application. Note: oversize pistons in this family require cylinder sleeving.