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  1. Honda TRX
    I bought a 2001 Honda 400ex. It’s got a K&N air filter on it and a Lexx MXE exhaust on it. Sounds great Idles fine but as soon as I give it a little bit of throttle it backfire and pops all crazy. I have jetted to 40 pilot and 155 main. Someone help I’m also at 400 elevation. I’m so stuck please...
  2. ATV General Discussion
    I have a 2007 400ex with oil leaking from the top of the engine. Any suggestions as to what I am getting into for repairs? Thanks in advance.
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