Yamaha YFM250 Timberwolf Piston Set - Wiseco - 8.71 CR - '90-'00. A forged piston kit built for the Yamaha Timberwolf 250 (1990–2000) to restore proper compression and reliable operation during rebuilds or performance-oriented maintenance.

This Wiseco Forged Series piston is engineered for 4-stroke ATV applications and provides a durable replacement for worn or damaged pistons. The kit is supplied as a complete package — piston, wrist pin, rings, and circlips — sized for a 72.00 mm bore and specified at an 8.71 compression ratio. Forged construction improves resistance to high-stress conditions and long-term service life while maintaining precise tolerances for correct fitment in the YFM250 engine.

Features

• Forged Wiseco piston for strength and longevity
• Complete kit: piston, wrist pin, rings, circlips
• 72.00 mm bore sizing, matched to stock dimensions
• 8.71 compression ratio (specified for this kit)
• Designed for Yamaha YFM250 Timberwolf model years 1990–2000

If you have questions about fitment, installation, or compatibility with modified heads or components, call us and our techs will help. We have two service locations offering installation and customization: Austin, Texas and the Los Angeles, California area. Call 512-982-9393 (TX) or 562-981-6800 (CA) for advice or to schedule service.

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