11:1 .080 Engine Rebuild Piston Gaskets for Honda TRX 400EX 1999-2008

Engine Rebuild Kit for Honda TRX 400EX

This engine rebuild kit for Honda TRX 400EX includes a Wiseco .080 overbore piston and a full gasket set to restore top-end compression and sealing on 1999-2008 models.

Overview

This engine rebuild kit for Honda TRX 400EX delivers the piston and gaskets needed to refresh a worn top end. The Wiseco .080 overbore piston raises compression to 11:1 for stronger throttle response, while the included gaskets seal the rebuild properly. It is built for riders and mechanics handling a complete top-end refresh on 1999-2008 TRX 400EX machines.

Built For Performance

• Wiseco .080 overbore piston for increased displacement
• 11:1 compression ratio for stronger power delivery
• Complete gasket set included for a full top-end reseal
• Forged piston construction for durability under load
• Designed as a direct fit for the TRX 400EX top end

Fits These Machines

• for Honda TRX 400EX 1999
• for Honda TRX 400EX 2000
• for Honda TRX 400EX 2001
• for Honda TRX 400EX 2002
• for Honda TRX 400EX 2003
• for Honda TRX 400EX 2004
• for Honda TRX 400EX 2005
• for Honda TRX 400EX 2006
• for Honda TRX 400EX 2007
• for Honda TRX 400EX 2008

On-The-Job Use

• Top-end rebuilds after piston wear or compression loss
• Trail and off-road riding where reliable power matters
• Workshop rebuilds on 1999-2008 TRX 400EX quads
• Routine maintenance to extend engine service life

Specs At A Glance

Good To Know

Q: Does this kit require boring the cylinder? A: Yes, a .080 overbore piston requires the cylinder to be bored and honed to match the new piston size before assembly.

Q: Are gaskets included with the piston? A: Yes, this kit bundles the Wiseco .080 piston with a gasket set for the top-end rebuild.

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