Namura .040 Over Bore Top End Repair Kit for Honda Foreman 500 2005-2011 93mm

Namura .040 Over Bore Top End Repair Kit for Honda Foreman 500

This Namura .040 Over Bore Top End Repair Kit provides a complete piston, rings, gaskets, and wrist pin for rebuilding the top end of Honda Foreman 500 engines from 2005 to 2011, fitted with a 93mm bore size. Designed for a .040 inch oversize, this kit restores compression and power in worn cylinders without requiring a full cylinder replacement.

Overview

The Namura .040 Over Bore Top End Repair Kit is a comprehensive solution for refreshing the upper cylinder assembly on Honda Foreman 500 models manufactured between 2005 and 2011. It includes a precision‑machined piston with rings, a complete gasket set, and a wrist pin, allowing a reliable .040 over bore rebuild that restores engine performance and extends the life of your ATV. This top end repair kit is engineered to meet or exceed OEM specifications, giving you a dependable repair option for your Foreman 500.

Built For Performance

• Piston is cast from high‑silicon aluminum alloy for reduced expansion and quiet operation
• Precision‑ground ring set provides excellent cylinder seal and oil control
• Complete gasket set includes head gasket, base gasket, and all necessary seals
• Wrist pin is carburized for wear resistance and includes retaining clips
• .040 oversize allows clean‑up of cylinder bore imperfections
• Kit is balanced and weight‑matched for smooth engine operation

Fits These Machines

• for Honda Foreman 500 (2005-2011)

On-The-Job Use

• Engine rebuild after top‑end wear or loss of compression
• Restoring power and reliability in farm, trail, or utility ATVs
• Replacing damaged pistons or worn rings during a comprehensive overhaul
• As a preventive maintenance upgrade when cylinder is already bored oversize

Specs At A Glance

Good To Know

Q: Do I need to have my cylinder bored to use this .040 over kit? A: Yes, this kit is intended for cylinders that have been bored to the .040 oversize dimension; a proper hone and bore job by a qualified machine shop is recommended.

Q: Does the kit include a new cylinder or just the internal parts? A: This is a top end repair kit containing piston, rings, gaskets, and wrist pin only; the cylinder itself must be reused or replaced separately.

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