Yamaha WR 450 F Piston Kit - Vertex Pistons - Forged Replica - 03-15. A complete, forged-replica piston kit engineered for 2003–2015 Yamaha WR450F models. Designed as a direct replacement to restore compression and reliability in used or modified engines.

This Vertex piston kit provides a reliable, precision-fit option for riders rebuilding or upgrading their WR450F. Available in A, B or C sizes to match your cylinder bore, the pistons help minimize blow-by and reduce oil consumption when installed to the correct specifications. Each kit ships complete with piston, rings, wrist pin and circlips so you have the components needed for a proper installation. Skirts are treated with a molybdenum disulphide (MoS2) coating to promote faster break-in and reduce friction during initial operation. The forged-replica pistons are heat treated using a T-5 hardening and tempering cycle to achieve the material properties expected for demanding off-road use.

Features

• Exact fit A, B or C piston sizes to match 03–15 WR450F cylinder bores
• Complete kit: piston, rings, wrist pin and circlips included
• Molybdenum disulphide (MoS2) coated skirts for improved break-in
• Forged-replica construction with T-5 heat treatment
• Helps reduce blow-by and oil consumption when matched to bore

If you have questions or need guidance on fitment or sizing, call us directly — we’re happy to help. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. 512-982-9393 (TX) | 562-981-6800 (CA). If you’re 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