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  1. Honda TRX
    I just bought a 2004 400ex that has a full White Brothers Exhaust. (pipe and muffler) It has all stock engine components and a stock carb and I want to run it with a closed lid on the airbox and a Two-Stage Foam Uni Air Filter. What should my jetting look like? I am new to this so any tips are...
  2. Honda TRX
    so i have a 400ex bored out to a 440ex with a stage 3 hot cam and a stage 1 or 2 crank not sure which on it is. Right now i’m running a 172 jet and a 50 jet and the thing backfires like back in Nam. I have the fuel screw turned out to 3 1/4 turn and still nothing. I have an holes in my air box...
  3. Honda TRX
    Does anyone have recommendations on what main jet and pilot jet I should use on my 05 400ex. This is my first quad and doing research on what other people are running on their pilot and main jet is confusing to me due to people running a range from 170 to 185. It is running 416 big bore kit...
  4. Honda TRX
    I have a 2000 trx400ex; the carb needle seems to need adjusting but, there’s only one position on the needle sooo.. any thoughts/suggestions? Bogging down, coming downhill and while level but, not going uphill. Help 😭 please and thank you.
  5. New Member Introductions
    I just got a Niche 440 Big Bore Kit for my 2001 TRX 400EX. I'm having some trouble getting it to idle correctly after jetting. I'll start with modifications made and then go into what I've already done for jetting. Modifications: 440 Big Bore Kit by Niche (the only new part, everything else has...
  6. Honda TRX
    Hello to all, I'm bran new to this forum. I recently bought a new 08 400ex and would like to add a K&N Power lid and Lexx slip on exhaust system for starters. Whats stumping me is what size jet to go with. I've done a lot of searching but haven't been able to get clear answers so I figured go to...
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