Yamaha YFM250 Timberwolf Piston Set - Wiseco - 8.71 CR, 71.00 mm Bore - `90-`00. A complete forged piston kit engineered for the Yamaha YFM250 Timberwolf models from `90-`00, offering a dependable replacement or upgrade for 4-stroke applications.

This Wiseco Forged Series piston is built for durability and consistent performance. Designed for a variety of 4-stroke machines, the kit includes everything required for installation — piston, wrist pin, rings, and circlips — and is sized at a 71.00 mm bore with an 8.71:1 compression ratio. The forged construction improves fatigue resistance under high-stress use and is suitable for enthusiasts who want a strong, serviceable piston for street, trail, or light performance builds.

Features

• Forged piston construction for improved strength and service life
• Complete kit: piston, wrist pin, rings, and circlips included
• 71.00 mm bore size matched to YFM250 specs
• 8.71 compression ratio (approx. 8.7:1) for stock-type combustion characteristics
• Designed for 4-stroke ATV applications including the Timberwolf `90-`00

If you have questions or need help confirming fitment, call us directly — Austin, TX: 512-982-9393, Los Angeles, CA area: 562-981-6800. We offer installation and customization services at both locations in Austin, Texas and the Los Angeles, California area. If you plan to purchase multiple items, contact us for possible shipping discounts. We install on premises at both locations.

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