Namura .020 Over Bore Top End Rebuild Kit for Honda TRX400EX & TRX400X 85.5mm

Namura .020 Over Bore Top End Rebuild Kit for Honda TRX400EX & TRX400X 85.5mm

This Namura top end rebuild kit delivers everything needed to restore compression and power on Honda TRX400EX and TRX400X ATVs using a .020 over bore and 85.5mm piston.

Overview

The Namura .020 over bore top end rebuild kit is a comprehensive package for Honda TRX400EX and TRX400X models, featuring a high-performance piston, rings, wrist pin, circlips, and gaskets. Designed for engine rebuilds, this top end rebuild kit ensures a precise fit for the 85.5mm bore size, helping riders maintain peak performance.

Built For Performance

• Premium .020 over bore 85.5mm piston for increased displacement
• High-strength rings and wrist pin for reliable operation
• Complete gasket set included for a seamless rebuild
• Precision-machined components for optimal fit
• Durable construction withstands high RPM and heat
• Engineered for easy installation with standard tools

Fits These Machines

• for Honda TRX400EX
• for Honda TRX400X

On-The-Job Use

• Ideal for restoring top end power in Honda TRX400EX sport ATVs
• Commonly used during full engine rebuilds or top end refresh
• Suitable for trail riding, racing, and recreational riding
• Designed for mechanics and DIY builders working on Honda 400EX engines
• Handles sustained high-load conditions in off-road environments

Specs At A Glance

Good To Know

Q: Does this kit include the cylinder? A: No, this is a top end rebuild kit that includes the piston, rings, wrist pin, circlips, and gaskets; the cylinder is reused or sourced separately.

Q: Is the .020 over bore suitable for all Honda TRX400EX models? A: The .020 over bore is designed for cylinders that have been bored 0.020 inch oversize; confirm your cylinder bore condition before ordering.

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