557M05500 Wiseco Piston Kit for Suzuki RM125 1987 55.00 mm

Piston Kit for Wiseco 557M05500 .040 for RM125

This Wiseco 557M05500 .040 piston kit is an oversized 55.00 mm top-end assembly that restores compression and power in a 1987 RM125 engine.

Overview

This Wiseco 557M05500 .040 piston kit gives a 1987 RM125 a fresh oversized top end at 55.00 mm. The kit pairs a forged piston with rings, wrist pin, and circlips so the cylinder can be bored to match and rebuilt in one job. It suits riders and mechanics reviving a worn two-stroke motocross engine.

Built For Performance

• Forged piston construction for strength under high rpm
• Oversized 55.00 mm bore size for a rebored cylinder
• .040 oversize step from the standard bore
• Rings, wrist pin, and circlips included for a complete top-end refresh
• Designed to match Wiseco 557M05500 piston kit specifications

Fits These Machines

• for Suzuki RM125, 1987

On-The-Job Use

• Top-end rebuilds after cylinder wear or seizure
• Motocross and off-road engine refreshes
• Bored-over cylinders needing an oversized piston
• Race prep and seasonal engine maintenance

Specs At A Glance

Good To Know

Q: Does this piston kit fit a standard bore cylinder? A: No, this is a .040 oversize piston at 55.00 mm, so the cylinder must be bored to match before installation. Confirm your current bore size before ordering.

Q: What is included in the kit? A: The kit includes the 55.00 mm piston along with the rings, wrist pin, and circlips needed for a top-end rebuild. Check the listing contents for the exact included components.

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