Namura .040 Over Bore Piston Kit for Honda Foreman 400 4x4 fits 1995-2003 87mm

.040 Over Bore Piston Kit for Honda Foreman 400 4x4

This .040 over bore piston kit is a direct replacement for Honda Foreman 400 4x4 models from 1995 to 2003, featuring an 87mm bore size to restore engine performance.

Overview

The .040 over bore piston kit is designed to rebuild the engine of a Honda Foreman 400 4x4, increasing displacement slightly while refreshing worn components. This kit includes everything needed for a top-end overhaul, making it an essential part for maintaining reliable power on the trail or job site. The 87mm piston delivers a precise fit after the cylinder is bored to match.

Built For Performance

• High-strength aluminum alloy construction for durability
• Precision-machined piston skirt reduces friction
• Includes piston rings, wrist pin, and circlips for a complete kit
• .040 overbore size provides a fresh surface and slight displacement increase
• Designed to match OEM specifications for reliable operation

Fits These Machines

• for Honda Foreman 400 4x4 (1995-2003)

On-The-Job Use

• Restoring lost compression and power in aging ATVs
• Rebuilding engines after top-end wear or damage
• Improving throttle response and torque for off-road riding
• Maintaining reliable operation during farm or ranch work

Specs At A Glance

Good To Know

Q: What is included in this piston kit? A: The kit includes one piston, piston rings, wrist pin, and circlips. All components are pre-matched for proper clearance.

Q: Does this require machining the cylinder? A: Yes, the cylinder must be professionally bored to 87mm to accept this oversize piston. Consult a qualified machine shop.

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