Yamaha YFM250 Timberwolf Piston Kit - Wiseco - 8.7:1 CR, 71.50 mm Bore - `90-`00. A precision-forged replacement piston kit designed to restore performance and durability in YFM250 Timberwolf engines from 1990–2000.

This Wiseco piston kit is engineered specifically for the Yamaha YFM250 Timberwolf and built to tight tolerances for reliable fitment. The forged 4-stroke piston construction improves tensile strength for long service life while maintaining a balanced strength-to-weight ratio. This kit is supplied complete with high-quality piston rings, wrist pin(s), and circlips, and is machined in Mentor, OH. Specified for a 71.50 mm bore (+0.5), the piston yields an 8.7:1 compression ratio and is intended for direct replacement where that sizing is required.

Features

• Application: Yamaha YFM250 Timberwolf 1990–2000
• Bore: 71.50 mm (+0.5)
• Compression Ratio: 8.7:1
• Forged 4-stroke piston, engineered for specific powersports engines
• Includes piston rings, wrist pin(s), and circlips
• Engineered, forged, and machined in the USA (Mentor, OH)

If you have questions about fitment, clearances, or compatibility with other modifications, call us directly — we’re happy to help: 512-982-9393 (TX) or 562-981-6800 (CA). We have locations in Austin, Texas and the Los Angeles, California area where we offer installation and customization services. If you’re considering 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