Feb 21, 2009 · Honda’s 400EX is one of the most popular ATVs on the planet. After ten years in existence, it has proven to be exciting to ride and pretty hassle-free to maintain. If you are thinking of investing in a new 400EX or even looking at a used one, we want to tell you which cost effective products out there can make it even better.

Jul 22, 2011 · I want to know what the best mods are for a 400ex are. I have nerfs, maxxas razr rear tires, and handle bars, also i think the carb has been jetted. I need an air filter and a valve cover gasket as well.

Apr 28, 2015 · Hi! nice mod list you got here. but do you have a build thread featuring the exhaust?

TRX400EX Pipe Kit – The CT Racing Sonic TRX 400EX exhaust system includes a stainless header, muffler with 12 discs, and jet kit including our titanium needle. CLICK HERE to see how we did in the Dirt Wheels Magazine TRX400EX pipe shootout.

Jul 5, 2012 · The 400ex is a good solid base and unmodded they run forever! But if you do a nice build internally they rip! It all depends on your riding style and how much you can handle.

May 7, 2021 · Best Affordable Exhaust for The 400EX and Warrior? Resonant Racing. We added a BIG BORE and CAM to our 400EX (Results SHOCKED US!) - Quad Warz S1 E2. https://www.rockymountainatvmc.com/?r...

Feb 21, 2023 · The 400ex are limited by the air pressure wave getting chocked up in the small exhaust port and a small header primary. A fcr 38-39mm carb is best choice but a 04-05 trx450 carb work great as well (+1mm bore over stock )and jetting a long with a good sealed up air box and battery relocation you have a trail machine that you can put hours on ...

Feb 19, 2010 · So I’ve got a 2000 Honda 400ex absolutely love it!! I’ve had it for about a month, I ride with bruteforce 750’s, outlander 850’s and 1000 sxs’s and I was thinking of getting a trx450r carb and a full hmf exhaust.

Jul 19, 2012 · There was also a mod on the muffler, which I will explain later. The reason I chose the rubber intake is because it is very thick, more than 1/4 of an inch, compared to the cheap thin plastic where heat transfers easily.

Jun 24, 2008 · I have a '03 Honda Sporttrax 400EX with a new aftermarket carb on it that seems to be having issues. I can start it but it idles really rough and when I give it throttle it just kills the engine. I have tried adjusting the idle screw but to no avail.