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  1. 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...
  2. 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
  3. Maintenance / Important Information
    I have a 2002 400ex that is running lean. I will let it idle for a min or two, do a lap around the yard, and it will be pretty hot. I checked the plug and it was white. Only modification I have is fmf slip on. Everything else is stock. I am around 800ft above sea level. What jet size would I...
  4. Site Help and Suggestions
    Hi I just rejetted my bike today with the dynojet kit. I have an 02 400ex with a 440 big bore kit, big gun full exhaust, and moose air filter with no lid. I used a size 42 pilot jet and 170 main jet which is the size that the kit recommended. I also changed the needle to the one that came with...
  5. New Member Introductions
    Hi everyone! I just bought a Honda 1999 TRX400. The following mods were already made, so I'm trying to fix black smoke coming out at high rpms. I'm new into ATV repairs, so even though I've been reading so much, I still don't get it... It has a nice white brothers pipe, K&N filter, but it's...
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