85mm Cylinder Piston Gasket Top End Kit & Camshaft For Honda TRX400EX TRX400X

85mm Cylinder Piston Gasket Top End Kit & Camshaft for Honda

This 85mm cylinder piston gasket top end kit and camshaft is a complete rebuild package for the Honda TRX400EX and TRX400X, restoring compression, sealing, and valve timing in one purchase.

Overview

This 85mm cylinder piston gasket top end kit and camshaft bundles the cylinder, piston, gaskets, and camshaft needed to refresh the top end of a Honda TRX400EX or TRX400X. The 85mm bore size matches the stock displacement class, and the included camshaft works with the valvetrain to keep timing and lift in spec. It suits riders and mechanics handling a worn top end, oil consumption, or a full engine rebuild.

Built For Performance

• 85mm bore cylinder sized for the TRX400EX and TRX400X top end
• Piston matched to the 85mm cylinder bore
• Complete gasket set for sealing the cylinder, head, and related joints
• Camshaft included to restore valve timing and lift
• Parts bundled as one kit to simplify ordering
• Direct-fit replacement configuration for the listed models

Fits These Machines

• for Honda TRX400EX
• for Honda TRX400X

On-The-Job Use

• Top end rebuilds after compression loss or oil burning
• Piston and cylinder replacement on worn engines
• Camshaft service alongside valve and timing work
• Gasket replacement to stop leaks at the cylinder and head

Specs At A Glance

Good To Know

Q: Is any machining required before installing this kit? A: No, the 85mm cylinder is supplied ready to fit the listed models, though checking piston-to-cylinder clearance before assembly is good practice. Clean mating surfaces and use fresh gaskets for a reliable seal.

Q: Is the camshaft matched to the included piston and cylinder? A: The camshaft is packaged as a top end component for the TRX400EX and TRX400X, so timing and lift stay within the stock configuration when installed properly. Verify valve clearance after assembly.

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