Namura Top End Repair Kit fits Kawasaki 1982-90 JS SX 550 .020 Over Bore 75.5mm

Top End Repair Kit for Kawasaki

This top end repair kit is a complete engine rebuild set for Kawasaki JS 550 and SX 550 watercraft, featuring a .020 over bore (75.5mm) piston and gaskets.

Overview

This top end repair kit delivers all necessary components to restore compression and performance in Kawasaki JS and SX 550 two-stroke engines. Designed for a .020 over bore (75.5mm), it includes a precision-machined piston, rings, wrist pin, circlips, and a complete gasket set. Ideal for racers or recreational riders rebuilding a Kawasaki 550 top end.

Built For Performance

• Includes a .020 over bore (75.5mm) piston for increased displacement
• Features a high-strength aluminum alloy piston for durability
• Complete gasket set ensures leak-free sealing
• Precision-machined components for consistent compression
• Designed for easy installation with professional-grade fit

Fits These Machines

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

On-The-Job Use

• Restoring top-end compression on vintage Kawasaki stand-up jet skis
• Rebuilding engines after a piston seizure or top-end failure
• Upgrading to a .020 over bore for increased power output
• Replacing worn cylinder components during full engine overhaul

Specs At A Glance

Good To Know

Q: Is the piston included pre-assembled with rings? A: The piston rings are included but need to be installed onto the piston; follow the manufacturer’s ring gap specifications.

Q: Does this kit include the cylinder? A: No, this kit is a top end repair kit that provides the piston, rings, gaskets, and hardware; the cylinder and cylinder head are not included.

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