508M04900 Wiseco .040 Oversize Piston Kit 49.00mm for Yamaha YZ80 1984

Piston Kit for Yamaha YZ80

This Wiseco .040 overbore piston kit for Yamaha YZ80 delivers the 49.00 mm bore size needed to refresh a worn top end, and it cross-references to 508M04900.

Overview

This piston kit for Yamaha YZ80 is a .040 overbore replacement designed to restore compression and power once the cylinder has been bored to match. The 49.00 mm piston for Yamaha YZ80 works with the Wiseco 508M04900 kit number, giving riders a straightforward top-end rebuild option. It suits anyone rebuilding a 1984 YZ80 engine who needs a matched piston and ring set.

Built For Performance

• Forged piston construction for strength under high-rpm two-stroke loads
• .040 overbore size of 49.00 mm for cylinders that have been bored oversize
• Kit supplied with piston, rings, wrist pin, and circlips for a complete top-end refresh
• Wiseco 508M04900 part number matches the listing reference for easy verification
• Machined ring grooves and skirt profile suited to two-stroke port timing

Fits These Machines

• for Yamaha YZ80 1984

On-The-Job Use

• Top-end rebuilds after cylinder wear or scoring
• Bore-out overhauls that require a matched oversize piston
• Motocross and trail riding maintenance on older YZ80 machines
• Restoring compression on a tired two-stroke engine

Specs At A Glance

Good To Know

Q: What does the .040 marking mean on this piston kit? A: It means the piston is sized for a cylinder bored .040 inch over stock. The cylinder must be machined to match before installation.

Q: Does the kit include rings and a wrist pin? A: A Wiseco piston kit of this type normally ships with the piston, rings, wrist pin, and circlips. Confirm the exact contents with the listing before ordering.

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