Namura .040 Over Bore Piston & Gasket Kit for Kawasaki KLX400 91mm

Piston & Gasket Kit for Kawasaki

This .040 over bore piston and gasket kit is designed for Kawasaki KLX400, featuring a 91mm bore size to restore engine compression and performance.

Overview

This .040 over bore piston and gasket kit from Namura provides a complete solution for rebuilding the top end of a Kawasaki KLX400 engine. The kit includes a forged piston, rings, wrist pin, and all necessary gaskets for a precise fit. It is intended for KLX400 owners who need to restore lost compression or increase displacement slightly after cylinder wear.

Built For Performance

• Forged aluminum piston offers high strength and heat resistance
• .040 over size allows for cylinder cleanup and improved seal
• Includes complete gasket set for hassle-free installation
• Precision-machined wrist pin and circlips for secure connection

Fits These Machines

• for Kawasaki KLX400

On-The-Job Use

• Rebuilding top end of Kawasaki KLX400 after high-mileage or piston failure
• Restoring compression for better starting and throttle response
• Performing off-road trail maintenance and engine refresh

Specs At A Glance

Good To Know

Q: Does this kit include everything needed for a top-end rebuild? A: Yes, it includes the piston, rings, wrist pin, circlips, and a full set of gaskets for the cylinder head and base.

Q: Is the piston pre-assembled with the wrist pin? A: No, the wrist pin and circlips must be installed during assembly; ensure proper orientation following the Kawasaki service manual.

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