Namura .020 Over Bore Piston Kit for Honda XR400R fits 1996-2004 Models 85.5mm

.020 Over Bore Piston Kit for Honda

This .020 over bore piston kit for Honda XR400R is a direct replacement piston assembly designed to restore compression and power in 1996-2004 models with an 85.5mm bore size.

Overview

The .020 over bore piston kit for Honda XR400R provides a precision-machined piston and rings that increase displacement slightly while renewing engine performance. Ideal for rebuilding or upgrading your Honda XR400R, this kit includes the piston, rings, and wrist pin for a complete top-end repair.

Built For Performance

• Manufactured from high-strength aluminum alloy for durability
• Precision-machined to .020 over stock bore (85.5mm)
• Includes matching piston rings for proper sealing
• Designed to fit Honda XR400R engines from 1996 to 2004
• Heat-treated wrist pin reduces friction

Fits These Machines

• for Honda XR400R (1996-2004)

On-The-Job Use

• Off-road trail riding and enduro racing
• Engine rebuilds and top-end overhauls
• Increasing displacement for more low-end torque
• Replacing worn or damaged pistons

Specs At A Glance

Good To Know

Q: Will this piston kit work with my stock cylinder? A: This is a .020 over bore piston, so your cylinder must be bored to 85.5mm by a machine shop. Do not install without proper boring.

Q: Can I use this piston in a 1995 XR400R? A: This kit is designed for 1996-2004 models; earlier models may have different dimensions, so confirm compatibility.

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