Yamaha YFM350 Warrior Piston Kit - Wiseco - 111 CR - `87-`13. This Wiseco piston kit is a direct-fit forged replacement for Yamaha YFM350 Warrior/Raptor models covering 1987–2013, built to the tight tolerances expected for 4-stroke powersports engines.

Wiseco’s forged 4-stroke piston is engineered for this specific Yamaha application to provide improved material strength and consistent fitment. Each kit is manufactured and machined in the USA (Mentor, OH) to maintain dimensional accuracy. The design focuses on strength-to-weight balance and includes the essential hardware for installation, making it a practical upgrade for enthusiasts rebuilding or customizing their engine.

Features

• Forged Wiseco piston designed for Yamaha YFM350 Warrior/Raptor (1987–2013)
• 83.00 mm bore, 11.0:1 compression ratio (111 CR)
• Includes piston rings, wrist pin(s), and circlips
• Engineered and machined in Mentor, OH, USA; made for tight tolerances

This kit is intended for customers who want a reliable forged replacement that maintains OEM fit while offering the durability advantages of Wiseco forgings. If you have questions about fitment, compatibility, or installation, please call us directly. We have two installation and customization locations in Austin, Texas and the Los Angeles, California area and can help with on-site installation.

Call: 512-982-9393 (TX) or 562-981-6800 (CA). If you are considering purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

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