Wiseco 4767M08900 Forged Piston Kit CR Yamaha - 89mm 12 1 XT/TT/SR500

The Wiseco 4767M08900 is a high-performance forged piston kit designed for Yamaha XT, TT, and SR500 engines. Running a 12:1 compression ratio with an 89mm bore (3504XC), this piston is engineered to deliver maximum power output and long-term reliability in demanding riding conditions.

Wiseco pistons are manufactured using a high-silicon aluminum alloy forging process, producing a piston that is significantly stronger and more heat-resistant than cast alternatives. The precision forging also allows for tighter tolerances and improved ring seal, contributing directly to increased horsepower and torque.

Key Features:

• Forged from high-silicon aluminum alloy for superior strength and durability
• 12:1 high-compression ratio for increased performance
• 89mm bore size (3504XC oversize specification)
• Innovative piston skirt design optimizes power delivery and reduces friction
• Complete kit includes piston, rings, wrist pin, and circlips
• Oversize pistons require cylinder boring or sleeving to proper specification
• Made in the USA by Wiseco, a trusted name in performance pistons since 1941

This complete piston kit gives builders and engine builders everything needed for a top-end rebuild. Note: Because this is an oversize piston, the cylinder must be bored or sleeved to match the 89mm specification before installation.