Yamaha YZ 85 Top End Piston Kit - Vertex Pistons (A, B or C) for 2002-2018 models. A direct-replacement top end kit engineered to match your cylinder bore with the correct piston size for accurate fit and reliable break-in.

This Vertex kit includes the piston, rings, wrist pin and circlips required for a complete top-end refresh. Skirts are finished with a molybdenum disulphide (MoS2) coating to promote faster break-in and help reduce wear. Pistons are heat treated with a T-5 hardening and tempering cycle to provide consistent material properties. Choosing the correct A, B or C piston ensures minimal blow-by and controlled oil consumption when installed to the matched bore size.

Features

• Exact fit A, B or C piston options to match cylinder bore
• Complete kit: piston, rings, wrist pin and circlips included
• MoS2 (molybdenum disulphide) skirt coating for improved break-in and reduced scuffing
• T-5 heat treatment (hardening and tempering) for consistent piston strength
• Fits Yamaha YZ85 models from 2002 through 2018

If you have questions or need help selecting the right piston size, call us directly — we’re happy to assist. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. Call 512-982-9393 (TX) or 562-981-6800 (CA) to schedule service or discuss fitment. If you are considering 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