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  1. TRX General Discussions
    i was finishing up a rebuild on my 2006 trx 400ex i just had new valves, cam, and a timing chain installed. put it all together and went to start it it ran beautifully for 2 seconds then stalled, went to start it again and it was trying to crank but couldn't so i pulled the side plug and tried...
  2. Engine/EFI/Drivetrain
    Hi Im installing a new hotcam stage 2 into my 2006 trx 400ex and I cant get the two pins which hold the cam in place in i watched a few tutorials and they installed them by hand i can get them in even with a gentle couple taps from a hammer and punch Im thinking I need new pins cause mine might...
  3. Maintenance / Important Information
    New here, just wanted to try and get some input about a problem(s) I’ve been having lately. So I’ve got an 02 400ex had it for a few years and it’s been giving me a new problem lately. I’d like to preface by saying that the only things that’s been recently done to it has been a carb clean, a new...
  4. Maintenance / Important Information
    hey i just bought a 2006 trx 400ex it purred like a kitten when i bought it ive had it for two days and now i hear a ticking keep in mind its got an aftermarket exhaust so its pretty load ticking you can only hear it at idle or very low rpm i set the valves drained the oil and checked all the...
  5. Maintenance / Important Information
    Hi all! New to the forum and to the 400ex i recently bought a blown up 2003 Honda 400ex tore it down, split the case and found it needed a new engine. Found a good/used engine for it. I picked it up and upon pick up the guy said it has a 6 degree crank key. my question with everything torn...
  6. Maintenance / Important Information
    What’s up folks. I’m new to the forums & needed some help with jetting. I put a stage 2 Hotcams in it & a 10:1 Wiseco Piston ( New stock cylinder bore ) It’s got an HMF Performance tip. I’m currently running a bagged K&N Filter with the air box lid off & 2 Spal 4” fans on my oil cooler. I run...
  7. Engine/EFI/Drivetrain
    My 400ex would not shift properly and fall out of gear while riding. Took the clutch cover off and the piece in my picture was no longer touching the star piece. I need to know how it and the spring go back. Also should the star shaped piece be in a certain position when I connect the loose piece.
  8. Engine/EFI/Drivetrain
    I upgraded a trx400ex engine to the highest possible power output without a 460 kit. A complete Wiseco bottom end, 440 13:1 Wiseco top end, Advanced aluminum sleeve, ported polished head, Kibblewhite valve set with +1mm springs, stage 3 Hotcams cam, trx450r carb, 105 octane fuel, a CDI with the...
  9. Engine/EFI/Drivetrain
    I have a 2003 400ex (only owner). I had a problem with my transmission, when in 3rd gear transmission slipped and was it was hard to change gear after. I put a brand new clutch, I disassembled everything and I placed new forks, made sure i could shift through all the gears (engine removed) and...
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  11. TRX General Discussions
    Hello I just recently purchased a trx that needed new oil rings. I did a top end rebuild and got the quad put back together and now the engine won’t crank but the headlights will come on. No neutral light. It is a 2008. I believe my problem might be the cable that goes from the negative on the...
  12. Maintenance / Important Information
    Hi i have a 2005 honda trx400ex with a loud ticking noise. i did a valve adjustment and problem was still there. any advice on what to look at next. the motor is completely stock. i have done some research and found it could be different things causing the ticking. how am i able to tell if my...
  13. 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...
  14. Suspension/Steering/Chassis
    i recenlty bought a 2008 trx400ex the guy gave it to me with the grab bar not attached cause he didnt have the bolts but i noticed that there is no where to attach the grab bar that he bought it looks like every grab bar on ebay for a 400ex but where you attach the grab bar on my quad its just...
  15. TRX General Discussions
    Flipped the ATV a few times and replaced the bars but wasn't happy. Also, flipped it again and bent the bats. Don't want to pay the OEM price. Saw these and it says they have the OEM bend. Has anyone tried them? https://www.2wheel.com/moose-utility-oem-replacement-handlebars.html
  16. TRX General Discussions
    hi I'm going to meet a guy soon to possibly trade my trx400ex which is 01 for an 01 xr400. Do you think this would be an even trade? On nada his bike has more value but what's your guys opinions?
  17. New Member Introductions
    Hello, i am from argentina and i got a trx 400x 2013 some days ago, i am looking for a system exhaust. I was told that the best one for this quad si the curtis spark. But i am not sure because i am new un this topic. I want your opinion and thanks for reading it!
  18. TRX General Discussions
    Hi all, Please bear with me, I'm trying to get back in to off roading. I'm usually in my Jeep, but looking for a quad now. Used to ride dirt bikes. I'm a bit older, so I'd really like an electric start, 4 stroke, and with reverse. A mechanic friend told me to stay away from all the years of...
  19. New Member Introductions
    Hello -- need some advice. I have a 2001 400ex and I'm looking at getting either the new TRX 400x or the 450r. I mainly ride on a private property that has quite a bit of open fields as well as trails. However, I do plan on using more the state parks and I'm debating which quad to buy. It looks...
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