Yamaha YFM350 Raptor Piston Kit - Wiseco - 10.25:1 CR - `87-`13. A factory-fit forged piston kit for Yamaha YFM350 Warrior/Raptor model years 1987–2013, built to restore durability and maintain tight tolerances during modifications or engine refreshes.

Wiseco's forged 4-stroke piston is engineered for this specific powersports application and machined to exacting tolerances in Mentor, OH. The forging delivers improved tensile strength and a favorable strength-to-weight ratio compared with cast alternatives, while the matched machining helps maintain consistent clearances and ring sealing. This kit includes the components needed to complete a piston replacement and is intended for enthusiasts performing rebuilds or installing performance-oriented internals.

Features

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

This Wiseco piston kit is a straightforward choice for builders who want a durable, application-specific replacement piston with the hardware needed for installation. If you have questions or need help confirming fitment, call us directly — 512-982-9393 (TX) or 562-981-6800 (CA). We have two locations in Austin, Texas and the Los Angeles, California area where we offer installation and customization services. If you are thinking about purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

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