805M04850 Wiseco .040 Piston Kit for Yamaha YZ85 2002-2024 48.50mm

Piston Kit for Yamaha YZ85

This Wiseco .040 oversize piston kit rebuilds the top end of a Yamaha YZ85 two-stroke, cross-referencing 805M04850 at 48.50 mm.

Overview

This .040 piston kit for Yamaha YZ85 restores compression and top-end performance on 2002-2024 models. The 48.50 mm bore size indicates a second oversize step past stock, suited to freshly replated or re-bored cylinders. Riders and mechanics rebuilding a YZ85 top end will find this piston kit for Yamaha YZ85 a direct-fit solution for worn or seized pistons.

Built For Performance

• Forged construction for strength under high-rpm two-stroke loads
• .040 oversize piston at 48.50 mm to match a lightly over-bored cylinder
• Wiseco part number 805M04850 for easy cross-reference
• Kit includes piston, rings, pin, and circlips for a complete top-end rebuild
• Designed for the Yamaha YZ85 2002-2024 model range

Fits These Machines

• for Yamaha YZ85 2002
• for Yamaha YZ85 2010
• for Yamaha YZ85 2015
• for Yamaha YZ85 2020
• for Yamaha YZ85 2024

On-The-Job Use

• Top-end rebuilds after a piston seizure or ring wear
• Fresh cylinder plating jobs requiring an oversize piston
• Mini motocross race bike maintenance between events
• Trail and practice bike refresh for YZ85 owners

Specs At A Glance

Good To Know

Q: Does this kit include gaskets? A: Piston kits of this type typically include the piston, rings, wrist pin, and circlips; top-end gaskets are usually sold separately, so check the listing contents before ordering.

Q: Can I install this in a stock cylinder? A: A .040 oversize piston requires a cylinder already bored or replated to 48.50 mm, so measure your bore before purchase.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.