Namura .040 Over Bore Top End Kit for Honda FourTrax TRX200SX 1986-1988 66mm

Namura .040 Over Bore Top End Kit for Honda

This top end kit rebuilds the cylinder and piston assembly for Honda FourTrax TRX200SX 1986-1988 models, delivering a .040 over bore for increased displacement and compression. It includes all necessary components to restore engine performance. OEM cross-reference numbers are not provided, but the kit is designed for the 66mm bore specification.

Overview

This top end kit is a complete cylinder and piston rebuild for the Honda FourTrax, featuring a .040 over bore to refresh worn bores. Designed for the TRX200SX from 1986 to 1988, this top end kit includes a piston, rings, pin, and gaskets for a reliable rebuild. It is ideal for restoring lost power and extending the life of your ATV engine.

Built For Performance

• .040 over bore increases engine displacement and compression
• Includes high-strength piston and rings for durability
• Precision-machined cylinder for consistent fit
• Complete gasket set included for easy installation
• Designed to meet or exceed OEM specifications

Fits These Machines

• for Honda FourTrax TRX200SX 1986
• for Honda FourTrax TRX200SX 1987
• for Honda FourTrax TRX200SX 1988

On-The-Job Use

• Rebuilding a worn-out top end on a Honda FourTrax ATV
• Increasing engine power for trail riding or utility work
• Restoring compression in a high-mileage engine
• Replacing a damaged cylinder and piston assembly

Specs At A Glance

Good To Know

Q: Is this kit compatible with a stock cylinder? A: This kit is designed for a cylinder that has been bored .040 over, so your stock cylinder must be machined to accept the oversized piston.

Q: Do I need any additional parts for installation? A: You may need new gaskets and seals, though most are included; always check your cylinder head condition before assembly.

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