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  1. Engine/EFI/Drivetrain
    So I have a 2014 Trx400x that I just finished installing a 440 big bore kit and a stage 2 cam. All new gaskets and seals. The rebuild went smoothly no hiccups got the bike back together and after some tweaking got it running rough with the stock jetting. It ran rough and after about 2 minutes...
  2. Dyno/Tuning Room
    I have a 2002 400ex bored to 416 with stage 2 hotcam, ECO Big Gun exhaust, stock carb, and stock intake. I was wondering if I should get bigger jets and open my intake some more. It runs good now, a little rich but I was looking for more power if I could. I don’t have much knowledge on intake...
  3. Maintenance / Important Information
    Hello everyone I will try and make it as short as possible!! I have a honda trx 400 ex 2005 for a year now and it runs perfect , every gear runs smoothly from closed to full throttle , no sputtering , boging or anything and she is stock , I did nothing to her except take the original exhaust...
  4. Maintenance / Important Information
    i bought a 2008 trx400ex a week ago it has a new 440cc big bore that the guy installed, i still have the stock bore which is in good condition and pistons. The upgrades i have are the big bore an hmf slip on and that all that i know of airbox is still on i dont know if the quad has been jetted i...
  5. Engine/EFI/Drivetrain
    Hi, I have a 100% stock 2002 400ex, I still have the stock exaust and no plan or money to get an aftermarket slip on. The other day I took the tip of the muffler, and I really liked the way it sounded, it was a lot deeper then stock, and sounded great under a load. My question is, i rode it...
  6. Dyno/Tuning Room
    I have a 2000 400ex that I just bought. I am going to be putting a Lexx slip on exhaust on and an Uni Air filter. Any suggestions on jet size or a kit I could buy to have a little bit of a range of sizes
  7. Dyno/Tuning Room
    Hey guys I'm new to the forums and could use some help with jetting my 02 400ex. I live in PA altitude around 1000ft. I have a unit air filter with no air box lid and a full white bros exhaust. I have no idea what to make my main jet size so any suggestions?????
  8. Maintenance / Important Information
    Need to remove carb for a 're-jetting and cleaning. Are there simpler ways to do this than to remove rear plastic and airbox? Trying to avoid more b/s than I have to! :eek:
  9. Engine/EFI/Drivetrain
    Help!- The quad will not idle more than 10 seconds with choke off and also a pain to get going unless you leave choke on and pop-it once your get going. Wont even idle long with choke off after an hour ride. Notes: This quad has always had this problem since I bought it new two years ago...
  10. Engine/EFI/Drivetrain
    Installing stage1 hc check signiture for mods cc etc. Should my mj be sufficient or to small all input welcome thanks :confused:
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