Namura Piston Kit fits Kawasaki 1982-1990 JS 550 & SX 550 .020 Over Bore 75.5mm

Namura Piston Kit .020 Over Bore 75.5mm for Kawasaki

This aftermarket piston kit replaces OEM components for Kawasaki JS 550 and SX 550 models from 1982 to 1990, featuring a .020 over bore of 75.5mm to restore engine performance after cylinder wear.

Overview

This Namura piston kit is a direct replacement for Kawasaki JS 550 and SX 550 personal watercraft, offering a .020 over bore of 75.5mm to refresh worn cylinders. The kit includes the piston, rings, wrist pin, and circlips, providing everything needed for a complete rebuild. Designed for enthusiasts and mechanics seeking reliable performance on the water.

Built For Performance

• Manufactured from high-strength aluminum alloy for durability
• Precision-machined to 75.5mm with .020 oversize for cylinder correction
• Includes high-quality piston rings for optimal compression
• Features a properly weighted wrist pin for balanced operation
• Engineered to meet or exceed OEM specifications

Fits These Machines

• for Kawasaki JS 550 (1982-1990)
• for Kawasaki SX 550 (1982-1990)

On-The-Job Use

• Commonly used in personal watercraft engine rebuilds
• Ideal for restoring power after cylinder wear or scoring
• Suitable for recreational and competitive jet ski applications
• Preferred by DIY mechanics and professional shops for reliability

Specs At A Glance

Good To Know

Q: Is this piston kit compatible with standard bore cylinders? A: No, this is a .020 over bore size intended for cylinders that have been bored out, not standard bore. Always measure your cylinder before purchasing.

Q: Does the kit include the circlips? A: Yes, the Namura piston kit comes complete with piston, rings, wrist pin, and circlips for a full rebuild.

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