Yamaha YFZ 450 Piston Kit - Vertex Pistons - Forged Replica - `04-`09. A direct-fit forged replica piston kit designed for Yamaha YFZ 450 models from 2004 through 2009, offering a reliable replacement option for rebuilds and performance-minded builds.

This kit includes everything required for a piston replacement and is built to match cylinder bores with Exact Fit A, B or C sizing to reduce blow-by and oil consumption when properly matched. Pistons are forged replica construction and receive a T-5 hardening and tempering heat treatment for consistent material strength. Skirts are coated with molybdenum disulphide (MoS2) to lower initial friction for faster break-in and improved skirt life. Each kit ships with piston, rings, wrist pin and circlips to simplify installation and reduce parts sourcing time.

Features

• Exact Fit A/B/C sizes to match your cylinder bore and minimize blow-by
• Forged replica piston construction with T-5 heat treatment
• MoS2-coated skirts for reduced friction and quicker break-in
• Complete kit: piston, rings, wrist pin and circlips included
• Intended for Yamaha YFZ 450 model years 2004–2009

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