Namura .020 Over Bore Piston Kit for Kawasaki KLX400, KLX400R & KLX400SR 90.5mm

Namura .020 Over Bore Piston Kit for Kawasaki

This .020 oversize piston kit for Kawasaki KLX400, KLX400R, and KLX400SR engines restores compression with a 90.5mm bore diameter.

Overview

The Namura .020 over bore piston kit for Kawasaki KLX400 series is a high-quality replacement that restores lost compression. This 90.5mm piston kit is engineered from durable cast aluminum alloy for reliable performance in your KLX400, KLX400R, or KLX400SR engine. Whether rebuilding or upgrading, this piston kit delivers consistent power and durability.

Built For Performance

• .020 oversize for added displacement and compression
• 90.5mm bore diameter for exact fit
• Cast aluminum alloy construction for strength and heat dissipation
• Includes piston rings and wrist pin for complete installation
• Precision-machined for consistent clearance
• Meets OEM specifications for reliability

Fits These Machines

• for Kawasaki KLX400
• for Kawasaki KLX400R
• for Kawasaki KLX400SR

On-The-Job Use

• Off-road trail riding and enduro racing
• Motocross track days
• Recreational desert riding
• Engine rebuilds and performance upgrades
• Restoring vintage KLX400 motorcycles

Specs At A Glance

Good To Know

Q: Does this piston kit need any special tools for installation? A: Basic engine rebuilding tools are sufficient, but we recommend professional installation to ensure correct ring gap and clearance.

Q: Is this piston compatible with standard Kawasaki KLX400 cylinder? A: Yes, it is designed for the stock 90.5mm bore with .020 oversize, so the cylinder must be bored to matching spec.

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