Yamaha YFM350 Warrior Piston Kit - Wiseco - 10.25:1 CR - `87-`13. A direct-fit forged piston kit engineered for the Yamaha YFM350 Warrior/Raptor models from 1987–2013, with a 10.25:1 compression ratio and an 83.50 mm bore.

This Wiseco piston kit is built for riders who require durable, engine-specific components. Wiseco's forged 4-stroke pistons are machined to tight tolerances and designed for the exact demands of the YFM350 platform. The forging process improves tensile strength and optimizes the strength-to-weight ratio for long service life under typical powersports use. Each kit includes quality piston rings, wrist pin(s), and circlips, and is engineered, forged, and machined in the USA (Mentor, OH).

Features

• Fits Yamaha YFM350 Warrior/Raptor 1987–2013
• 83.50 mm bore; 10.25:1 compression ratio (oversize +0.5 mm option noted)
• Forged 4-stroke piston for improved tensile strength
• Includes piston rings, wrist pin(s), and circlips
• Engineered and machined in Mentor, OH, USA

If you have questions or want help choosing the right kit, call us directly — we’re happy to assist. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. Call: 512-982-9393 (TX) or 562-981-6800 (CA). If you’re thinking about 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