Getting the Most Out of 400ex air shrouds

If you've spent any amount of time tearing up trails or hitting the dunes on a Honda TRX400EX, you already know that 400ex air shrouds are way more than just decorative pieces of plastic or metal bolted to the side of your machine. For a quad that's been around as long as the 400EX, it's easy to take the basic components for granted, but these shrouds play a massive role in how the bike handles heat. Since the 400EX is air-cooled (well, technically air-and-oil cooled), it doesn't have a radiator and a fan to do the heavy lifting. It relies on movement. If you aren't moving, you aren't cooling, and that's where the design of the air shrouds comes into play. ...

May 21, 2026 · 7 min · Sufi Conner