Yamaha WR Piston Kit - Wiseco - 12.51 CR, 95.00 mm Bore - `03-`15. This Wiseco piston kit is built for riders who need a direct-fit, forged replacement piston for Yamaha WR and select YZ applications.

Designed from Wiseco's forged 4-stroke technology, this kit is engineered for the specific requirements of Yamaha WR models (03–15) and YZ450F (03–09). Manufactured to tight tolerances, the piston offers improved tensile strength and a strength-to-weight balance optimized for powersports engines. The package includes the piston, high-quality rings, wrist pin(s), and circlips, and is forged and machined in Mentor, OH, USA.

Features

• Forged 4-stroke piston specifically matched to Yamaha WR/YZ applications
• 95.00 mm bore size, 12.51:1 compression ratio
• Includes piston rings, wrist pin(s), and circlips for complete installation
• Dedicated forgings for improved tensile strength and durability
• Engineered and machined in the USA (Mentor, OH)

If you have questions about fitment, clearances, or tuning, call us directly — our tech staff can help confirm compatibility and discuss installation or customization options. We offer on-site installation and customization at two locations: Austin, Texas and the Los Angeles, California area. Call us at 512-982-9393 (TX) or 562-981-6800 (CA).

If you are considering purchasing multiple items, please contact us about shipping discounts. We install on premises at both locations.

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