Yamaha 450R Piston Kit - Wiseco - 12.41 CR - `09-`23. This Wiseco forged piston kit is built for Yamaha YFZ450/450R models from 2009–2023, offering a direct-fit replacement engineered for reliable performance and long-term durability.

Wiseco’s forged 4-stroke pistons are manufactured to tight tolerances for application-specific fit and improved tensile strength versus cast parts. This kit features a 95.00 mm bore and a 12.41:1 compression ratio, and includes high-quality piston rings, wrist pin(s), and circlips to simplify installation. Forged and machined in Mentor, OH, the design focuses on strength-to-weight optimization appropriate for sport and performance riding. Use this kit when restoring compression, repairing bore work to standard size, or upgrading from worn components while maintaining OEM-compatible dimensions.

Features

• Forged 4-stroke piston engineered for Yamaha YFZ450/450R 2009–2023
• 95.00 mm bore, 12.41:1 compression ratio
• Includes piston rings, wrist pin(s), and circlips
• Forged and machined in the USA (Mentor, OH)
• Optimized strength-to-weight for durability and service life

If you have questions or want help confirming fitment, call us directly at 512-982-9393 (TX) or 562-981-6800 (CA). We have two locations—Austin, Texas and the Los Angeles, California area—where we offer installation and customization services and install on premises at both locations. If you're considering multiple items, please contact us for potential shipping discounts and bundle options.

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