477M04800 Wiseco .040 Oversize Piston Kit 48.00mm for Yamaha YZ80 1982-1983

Piston Kit for Yamaha YZ80

This Wiseco .040 piston kit is a 48.00 mm oversize piston assembly for Yamaha YZ80 models, built to renew compression and top-end power. It cross-references 477M04800 for accurate replacement matching.

Overview

This Wiseco .040 piston kit provides a 48.00 mm oversize piston for Yamaha YZ80 engines that need a top-end rebuild. The Wiseco .040 piston kit uses forged construction for durability at high rpm. It fits builds where the cylinder has been bored .040 over stock.

Built For Performance

• Forged piston construction for strength under high-rpm use
• .040 oversize at 48.00 mm to match a rebored cylinder
• Designed as a direct replacement for the 477M04800 reference
• Suited to two-stroke top-end rebuilds
• Precision machined for consistent ring seal and compression

Fits These Machines

• for Yamaha YZ80 1982
• for Yamaha YZ80 1983

On-The-Job Use

• Top-end rebuilds after cylinder boring
• Motocross and trail riding maintenance
• Restoring compression on worn two-stroke engines
• Race prep and engine refresh projects

Specs At A Glance

Good To Know

Q: Will this fit a stock cylinder? A: This piston is .040 oversize and requires the cylinder to be bored to match 48.00 mm. Confirm the current bore size before ordering.

Q: Is this a complete top-end kit? A: This listing covers the piston kit as described. Check whether gaskets, rings, or pins are included 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.