Namura .060 Over Bore Top End Rebuild Kit Honda TRX400EX & TRX400X 86.5mm

.060 Over Bore Top End Rebuild Kit (86.5mm) for Honda

This aftermarket top end rebuild kit includes a .060 over bore piston and rings for Honda TRX400EX and TRX400X ATVs, restoring engine performance with a 86.5mm bore size.

Overview

This top end rebuild kit is designed for Honda TRX400EX and TRX400X models, delivering a .060 over bore (86.5mm) to refresh worn cylinders. It contains everything needed for a complete top end rebuild, making it ideal for off-road enthusiasts and racers. The kit ensures reliable power restoration and extended engine life.

Built For Performance

• Includes .060 over bore piston and rings for increased displacement
• Precision-machined 86.5mm piston for consistent compression
• High-strength rings reduce blow-by and improve sealing
• Complete gasket set for a secure top end reassembly
• Designed to meet demanding off-road conditions

Fits These Machines

• for Honda TRX400EX
• for Honda TRX400X

On-The-Job Use

• Trail riding and recreational ATV use
• Competition racing requiring reliable engine performance
• Engine rebuilding after high-mileage wear

Specs At A Glance

Good To Know

Q: Will this kit fit my TRX400EX? A: Yes, it is designed for the Honda TRX400EX and TRX400X models with a stock bore of 85.5mm; .060 over bore requires cylinder boring to 86.5mm.

Q: Does the kit include a wrist pin and circlips? A: The kit typically includes the piston, rings, and top end gaskets; confirm with the listing for additional components.

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