Namura .040 Over Bore Top End Kit for Honda TRX450R Sportrax 450R 2004-2005 95mm

Namura .040 Over Bore Top End Kit for Honda TRX450R

This top end kit from Namura is a complete .040 over bore cylinder and piston set for the Honda TRX450R Sportrax, designed to restore or increase engine displacement to 95mm. It includes piston, rings, wrist pin, and gaskets for a reliable rebuild of 2004-2005 450R models.

Overview

The Namura .040 Over Bore Top End Kit delivers a precision-machined cylinder and forged piston for the Honda TRX450R, boosting displacement to 95cc and refreshing worn top-end components. Riders rebuilding their Sportrax 450R will find this kit combines quality materials with exacting tolerances for improved performance and durability.

Built For Performance

• .040 over bore increases displacement to 95mm for added power
• Forged aluminum piston offers high strength and heat resistance
• Chrome-plated cylinder bore reduces wear and improves ring seal
• Includes premium ring set, wrist pin, and circlips for complete installation
• Matching head gasket and base gasket ensure proper sealing

Fits These Machines

• for Honda TRX450R Sportrax 450R (2004-2005)

On-The-Job Use

• Used for full top-end rebuilds on high-mileage or worn 450R engines
• Applied in motocross, trail riding, and desert racing applications
• Suitable for racers seeking a reliable overbore for increased displacement

Specs At A Glance

Good To Know

Q: Is the cylinder sleeve included? A: The kit includes a plated cylinder; no separate sleeve is needed as the bore is machined directly into the cylinder casting.

Q: Do I need to replace the connecting rod? A: This kit is a top-end rebuild; the connecting rod can be reused if in good condition, but it's recommended to inspect and replace if worn.

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