Namura .040 Over Bore Piston Kit for Honda TRX400EX & TRX400X Sportrax 86mm

Namura .040 Over Bore Piston Kit for Honda TRX400EX & TRX400X Sportrax 86mm

This Namura .040 over bore piston kit provides a piston and rings for a 0.040-inch overbore rebuild on Honda TRX400EX and TRX400X Sportrax engines.

Overview

The Namura .040 Over Bore Piston Kit is designed for Honda TRX400EX and TRX400X Sportrax models requiring a 0.040-inch oversized piston. This over bore piston kit includes a high-quality piston and rings to match the larger bore diameter. It is an excellent choice for restoring compression after cylinder wear.

Built For Performance

• Precision-machined piston for .040 overbore
• High-strength ring set for optimal seal
• Designed for 86mm final bore diameter
• Restores compression and power
• Direct fit for TRX400EX/TRX400X
• Durable aluminum alloy construction

Fits These Machines

• for Honda TRX400EX
• for Honda TRX400X Sportrax

On-The-Job Use

• Rebuilding top end of Honda TRX400EX and TRX400X ATVs
• Restoring compression after cylinder wear or damage
• Improving engine performance for trail riding or racing
• Replacing worn piston and rings during engine overhaul

Specs At A Glance

Good To Know

Q: Does this kit require machining the cylinder? A: Yes, the cylinder must be bored to 86mm to match this .040 over piston. Always have a qualified machine shop perform the work.

Q: Is this piston compatible with the stock crankshaft? A: Yes, this kit uses the standard wrist pin and fits the stock connecting rod for these models.

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