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  1. Engine/EFI/Drivetrain
    just bought this 400ex not long ago. It was smoking bad when I bought it. Did a new top end, piston cylinder and rings. The timing is perfect. I lashed the valves to spec twice. But still have a top end tick. Any idea on what this could be would be greatly appreciated. I included a link to the...
  2. Engine/EFI/Drivetrain
    Hello everyone , I’m new here I’m looking for some help I recently rebuilt bottom end and top end on a 2003 400ex everything stock except for hot rods crank standard size , hotcams stage 1 and kibblewhite valves , replaced L shift fork , all gears are in good condition has new clutch disks ...
  3. Engine/EFI/Drivetrain
    Sup guys, so someone stole the gas tube that comes from the reservoir on my 400, I just now got around to getting a replacement tube. The quad hasn't moved since october, because I haven't gotten a new tube until now. I put the tube on and turned the reservoir to ON and no fuel is running...
  4. 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.
  5. TRX General Discussions
    hey guys, I have a slip on yoshi for my 400ex but I’m not to happy with it. I’m looking into getting a new exhaust and I heard about the rossiers and the empires I love the looks of both but I’m mainly looking for power and sound! Any one who has tried both or knows anything about them that...
  6. Engine/EFI/Drivetrain
    I recently bought a 400ex non running. I got her running, but she smokes a lot hot or cold. I’m about to take it apart, but I’m wondering what I should purchase and replace while I’m inside the engine. I’m also wondering what brand piston I should go with. I want stock bore and have heard good...
  7. Engine/EFI/Drivetrain
    Hi everyone, I'm new here and I have a few questions regarding my 400ex. I bought it and it was already bored to a 440, I prefer the 416, but it's fine. Bought it anyways, ran good, and then I blew it up. Something made my intake valves go through the piston. No big deal right? Wrong. I got new...
  8. 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...
  9. Suspension/Steering/Chassis
    Saw these pretty reasonable priced shocks on eBay and am wondering if there legit or Chinese knock offs thanks! https://www.ebay.com/itm/HONDA-TRX400EX-TRX450R-STAGE-2-ADJUSTABLE-RACING-FRONT-SHOCKS-ABSORBER-SET/291999093168
  10. Maintenance / Important Information
    Hi every one, I just bought a 2003 400EX bored to 426 and notice that it’s missing the decompressor lobe on the camshaft. I was wandering if it would still start or I need to buy the lobe. Thanks in advance!! Also, what main jet should I be running? The engine is bored to 426 like I said, it got...
  11. Lighting
    I have a 2002 400ex and my neutral light never worked. Until one day I bought a new Oem neutral switch and wire going to it. I also put some never-seize on the bulb because it had loose connections. Now the neutral light will stay on in every gear and I can’t figure out why. If anyone knows...
  12. TRX General Discussions
    I have a 400ex bored to 416 and have a stage 2 hotcam. I have a krome dg slip on exhaust without spark arrester. Stock intake and carb with foam filter. I was wondering if I should change my jets, and if so what to? If I should make more airflow through the intake box with holes? It runs good to...
  13. 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...
  14. Engine/EFI/Drivetrain
    Hi there, I'm trying to run down a problem with aerated oil and I'm running out of things to check. Any advice would be appreciated. First question: This can't be normal right? After warming up the bike for 5-10 minutes, shut it off, check the dip stick or drain the oil from the oil tank...
  15. 400ex enough adjustment in carb means no need for jetting?

    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...
  16. Engine/EFI/Drivetrain
    rebuilt the top end on my 2007 honda trx400ex recently because it was blowing a little smoke and now it wont idle at all I turned the idle adjustment screw all the way in and it still will not idle it will idle if the it is choked but not when the choke is off.
  17. Engine/EFI/Drivetrain
    2003 400ex FOX Podium shocks Yoshimura full exhaust K&N filter DynoJet Stage 2 Jetted ProTaper handlebars ProTaper grips I have a pop sound only in 1st gear. Chain has 1 1/2 play in it. Any suggestions?
  18. Engine/EFI/Drivetrain
    I need opinions on my tuning: I've got a 2000 400ex, original motor, wrapped header, oil change. Rebuilt the carb and adjusted valves. After a lot of trouble with backfiring through the carb (signifying really lean) I'm running a 42 pilot jet and a 150 main jet. This helped a lot, but I'm still...
  19. Dyno/Tuning Room
    I know that there is a million different threads on this. However each set up is different. When I purchased my quad I was in TN and now I reside in Colorado. My quad seized up on me since I have been here. I have since rebuilt it and now I am in need of information on jetting for my altitude. I...
  20. Suspension/Steering/Chassis
    Has anyone ever tried this mod? does it actually work? is it worth it? will it work on a 06' 400ex?
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