Yamaha Raptor Piston Kit - Wiseco - 111 CR - `87-`13. This Wiseco piston kit is a direct-fit, forged replacement for the Yamaha YFM350 Warrior/Raptor (1987–2013) designed for riders looking to restore or upgrade their engine with a reliable, application-specific component.

Wiseco's forged 4-stroke pistons are engineered and machined to tight tolerances in Mentor, OH. This kit is built for the YFM350 platform with an 83.00 mm bore and an 11.0:1 compression ratio (111 CR). The dedicated forging and machining optimize strength-to-weight characteristics and improved tensile strength of the material helps extend service life under normal riding conditions. The kit includes the piston, high-quality piston rings, wrist pin(s), and circlips — everything required for a professional rebuild.

Features

• Forged 4-stroke piston engineered for Yamaha YFM350 Warrior/Raptor (1987–2013)
• 11.0:1 compression ratio (111 CR), 83.00 mm bore
• Includes piston rings, wrist pin(s), and circlips
• Forged and machined in the USA — Mentor, OH

If you have questions about fitment, installation, or suitability for your build, call us directly. We have two service locations offering installation and customization: Austin, Texas and the Los Angeles, California area. Call 512-982-9393 (TX) or 562-981-6800 (CA) to speak with a technician or to schedule service. If you plan to purchase multiple items, contact us for possible shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov