Yamaha Raptor Piston Kit - Wiseco - Forged Series 12:1 CR - `87-`13. A direct-fit Wiseco forged piston kit engineered for Yamaha Raptor (YFM350) applications, offered with a 12:1 compression ratio and an 84.00 mm bore for reliable performance upgrades.

This Forged Series piston is built for durability and consistent operation under higher loads. Each kit includes the piston, wrist pin, rings, and circlips for a complete rebuild of the short block. The forged construction improves strength and fatigue resistance compared with cast pistons, making it a suitable choice for riders seeking longer service life and dependable combustion characteristics in modified or stock-stroke engines. Exact bore, piston crown geometry, and ring pack maintain compatibility with 1987–2013 Raptor and Warrior models specified for the Wiseco YFM350 application.

Features

• Forged 4-stroke piston material for improved strength and durability
• Complete kit: piston, wrist pin, rings, and circlips included
• 12:1 compression ratio with 84.00 mm bore (YFM350 Raptor/Warrior fitment)
• Designed for ATV/UTV performance and dependable street or trail use

If you have questions about fitment, installation, or compatibility with other modifications, call us directly — we’re happy to help. 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 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