805M04750 Wiseco Std Piston Kit for Yamaha YZ85 2002-2024 47.50mm

Std Piston Kit for Yamaha YZ85

This Wiseco standard piston kit (part number 805M04750) is a 47.50mm piston assembly built to replace a worn or seized piston in the engine top end.

Overview

This Wiseco standard piston kit is a replacement piston assembly for the Yamaha YZ85 two-stroke dirt bike. The kit restores the factory 47.50mm bore size so the engine can regain proper compression and sealing. It suits riders and mechanics handling a top end rebuild after normal wear or a piston failure.

Built For Performance

• Wiseco forged piston construction for durability under two-stroke heat cycles
• 47.50mm standard bore size matching the original cylinder diameter
• Piston kit assembly includes piston, rings, pin, and clips as supplied
• Designed for small-displacement high-revving two-stroke engines
• Wiseco part number 805M04750 for easy reference

Fits These Machines

• for Yamaha YZ85 2002
• for Yamaha YZ85 2003
• for Yamaha YZ85 2004
• for Yamaha YZ85 2005
• for Yamaha YZ85 2006
• for Yamaha YZ85 through 2024

On-The-Job Use

• Top end rebuilds after piston or ring wear
• Routine maintenance on a raced or trail-ridden YZ85
• Restoring compression on a high-hour minibike engine
• Refresh before a race season

Specs At A Glance

Good To Know

Q: Does this kit come with rings and a wrist pin? A: Wiseco piston kits normally ship as a complete assembly including the piston, rings, pin, and clips, but confirm the exact contents with the listing before ordering.

Q: Can I install this piston without boring the cylinder? A: This is a standard bore piston, so it is intended for a cylinder that is still within spec at 47.50mm and does not require an overbore.

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