Kawasaki KLX450R Piston Kit - Wiseco - 121 CR - `08-`19. This Wiseco piston kit is a direct-fit forged 4-stroke replacement engineered for KLX450R models from 2008–2019, built to the tolerances and specifications required for serious riders.

Wiseco’s forged 4-stroke pistons are designed and machined for specific engine applications to provide improved tensile strength and consistent service life. This kit is a standard 96.00 mm bore with a 12:1 compression ratio (121 CR) and includes high-quality piston rings, wrist pin(s), and circlips. The dedicated forging and machining process helps optimize the strength-to-weight ratio for the piston, while precise tolerances support reliable fit and operation. Manufactured in Mentor, OH, this kit suits owners looking to restore or maintain original engine characteristics with trusted OEM-fit components.

Features

• Forged 4-stroke piston, application-specific design
• 96.00 mm bore, 12:1 compression ratio (121 CR)
• Includes piston rings, wrist pin(s), and circlips
• Machined and engineered in the USA (Mentor, OH)
• Optimized strength-to-weight from dedicated forgings

If you have questions or need fitment guidance, call us directly — we’re happy to help. We have two installation and customization locations: Austin, Texas and Los Angeles, California, and offer on-site installation at both shops. Call Austin: 512-982-9393 (TX) or Los Angeles: 562-981-6800 (CA).

If you’re considering purchasing 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