Namura .040 Over Bore Piston Kit for Honda Rancher 400 4x4 fits 2004-2007 86mm

Namura .040 Over Bore Piston Kit for Honda

This Namura .040 Over Bore Piston Kit is a replacement piston assembly designed to restore engine performance in Honda Rancher 400 4x4 ATVs from 2004 to 2007.

Overview

The Namura .040 Over Bore Piston Kit offers a cost-effective solution for top-end rebuilds on Honda Rancher 400 engines. This piston kit includes the piston, rings, and pin sized to .040 oversize for a precise fit in bored cylinders. It is ideal for owners of 2004-2007 Honda Rancher 400 4x4 machines looking to refresh their engine.

Built For Performance

• High-strength aluminum alloy piston for durability
• Precision-machined to .040 oversize for tight cylinder clearance
• Moly-coated compression ring reduces friction and improves seal
• Includes wrist pin and circlips for a complete installation
• Designed to handle high RPM and heat of ATV use

Fits These Machines

• for Honda Rancher 400 4x4 (2004-2007)

On-The-Job Use

• Top-end engine rebuild after high mileage
• Trail riding and utility work requiring consistent power
• Mudding and off-road conditions demanding reliability
• Restoring compression for improved starting and throttle response

Specs At A Glance

Good To Know

Q: Does the piston kit come with rings? A: Yes, the kit includes piston rings that are pre-gapped for standard .040 oversize but should be checked against your cylinder's actual bore.

Q: Can I use this kit on a Honda Rancher 400 without 4x4? A: The engine is the same across Rancher 400 models, but verify your engine code to ensure compatibility.

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