645M04850 Wiseco .040 Piston Kit for Suzuki RM80 1991-2001 48.50 mm

Piston Kit for Wiseco 645M04850 .040 for Suzuki RM80

This Wiseco 645M04850 .040 piston kit is a 48.50 mm oversize piston assembly built for Suzuki RM80 models from 1991 through 2001, bringing compression back to a freshly bored two-stroke top end.

Overview

The Wiseco 645M04850 .040 piston kit provides Suzuki RM80 owners a 48.50 mm oversize top-end option for cylinders that have been cleaned up past stock bore. This piston kit bundles the piston with rings, wrist pin, and circlips so the rebuild stays straightforward. It fits 1991 to 2001 RM80 machines and matches Wiseco part number 645M04850 for riders and mechanics doing their own top-end work.

Built For Performance

• Forged piston body built to handle two-stroke heat and cylinder pressure
• 48.50 mm oversize diameter, a .040 inch step over stock bore
• Complete kit with piston, rings, wrist pin, and circlips
• Precision-machined ring lands and skirt for consistent sealing
• Direct replacement for the 645M04850 part number
• Sized for cylinders already bored to match the 48.50 mm piston

Fits These Machines

• for Suzuki RM80 1991
• for Suzuki RM80 1992
• for Suzuki RM80 1993
• for Suzuki RM80 1994
• for Suzuki RM80 1995
• for Suzuki RM80 1996
• for Suzuki RM80 1997
• for Suzuki RM80 1998
• for Suzuki RM80 1999
• for Suzuki RM80 2000
• for Suzuki RM80 2001

On-The-Job Use

• Top-end rebuilds on an RM80 cylinder bored to 48.50 mm
• Motocross and off-road riding after a compression loss
• Seasonal race engine refreshes
• Bringing a 1991 to 2001 RM80 project back to life
• Shop work where the cylinder has already been machined to size

Specs At A Glance

Good To Know

Q: Can this piston go into a stock RM80 cylinder? A: No, this 48.50 mm piston is a .040 oversize and the cylinder must be bored and honed to match before it will fit.

Q: Is this a full top-end kit? A: The kit arrives as a complete piston assembly with rings, wrist pin, and circlips for a one-shot top-end rebuild.

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