Yamaha YFM350 Raptor Piston Kit - Wiseco - 10.25:1 Compression Ratio, 83.00 mm Bore (’87–’13). This Wiseco piston kit is a direct-fit, forged replacement for Yamaha YFM350 Warrior/Raptor models and is intended for riders who want a durable, application-specific piston assembly.

Wiseco’s forged 4-stroke pistons are engineered for specific engines and manufactured to tight tolerances. This kit uses dedicated forgings to optimize the strength-to-weight ratio and offers improved tensile strength for longer service life under typical powersports conditions. Each kit is machined in Mentor, OH, and includes the components needed for installation, making it suitable for enthusiasts performing engine refreshes or modest performance-oriented rebuilds without guessing on fitment.

Features

• Forged 4-stroke piston engineered for Yamaha YFM350 Warrior/Raptor (’87–’13)
• 83.00 mm standard bore, 10.25:1 compression ratio
• Includes high-quality piston rings, wrist pin(s), and circlips
• Dedicated forgings for optimized strength-to-weight
• Engineered, forged, and machined in the USA (Mentor, OH)

This kit is a practical choice for riders updating worn components or building a stronger, application-specific short-block. If you have questions about fitment, compatibility with your build, or installation options, call us at 512-982-9393 (TX) or 562-981-6800 (CA). We have two locations — Austin, Texas and the Los Angeles, California area — where we offer installation and customization services. If you’re 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