646M04850 Piston Kit for Yamaha YZ80 1993-2000 Wiseco .060 48.50 mm

Wiseco .060 Piston Kit for Yamaha YZ80

This Wiseco .060 oversize piston kit, part 646M04850, is a 48.50 mm piston assembly for Yamaha YZ80 engines, giving a worn top end a fresh bore-size match.

Overview

This Wiseco .060 piston kit for Yamaha YZ80 models from 1993 through 2000 delivers a 48.50 mm oversize piston for a rebuilt or re-bored cylinder. The kit is built for riders and mechanics refreshing top-end compression on a YZ80. Each piston kit for Yamaha YZ80 applications is sized at .060 over to match a machined cylinder bore.

Built For Performance

• 48.50 mm oversize piston sized at .060 over stock bore
• Forged piston construction for strength under high rpm
• Wiseco part number 646M04850 for easy verification
• Designed for two-stroke YZ80 top-end rebuilds
• Ring, pin, and clip hardware included in the kit

Fits These Machines

• for Yamaha YZ80 1993
• for Yamaha YZ80 1994
• for Yamaha YZ80 1995
• for Yamaha YZ80 1996
• for Yamaha YZ80 1997
• for Yamaha YZ80 1998
• for Yamaha YZ80 1999
• for Yamaha YZ80 2000

On-The-Job Use

• Top-end rebuilds after cylinder wear or seizure
• Re-bored cylinders that need an oversize piston
• Motocross and trail maintenance on YZ80 machines
• Restoring compression on high-hour engines

Specs At A Glance

Good To Know

Q: Does this piston kit fit a stock cylinder? A: It is a .060 oversize piston, so the cylinder must be bored and honed to match the 48.50 mm size before installation.

Q: What else should be replaced during a top-end rebuild? A: Check the ring end gap, wrist pin bearing, and cylinder plating or bore condition, then replace worn parts as needed.

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