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  1. Honda TRX
    Just installed a new wire harness on the 2000 400ex and am replacing a non existing brake light. Used brown as positive(+) and green as ground(-) and ground out the white wire on the new light. Will not turn on no matter what I do! Looking for help
  2. New Member Introductions
    So I was changing my clutch and I had these washers/spacers left and can not find where they go I have been losing my mind over this so any help would be much appreciated, or if anybody knows a 400ex mechanic specialist
  3. Performance Modifications
    Hello. I just recently bought a msd ignition enhancer made for a 400ex that had never been mounted or used. I’m in the process of hooking it up and routing it into my quads harness and im Having some difficulty doing so. Is there anyone on here who has mounted one of these up before and that can...
  4. Honda TRX
    Hello, I recently bought a used 2007 400ex. I got a pretty good price on it, and it ran awesome when I tested it. I got home and decided it would be a good idea to do basic maintenance on it, change oil, replace oil filter, clean air filter, cleaned & lubed chain. I completely forgot to check...
  5. Repair & Maintenance
    Hello, I recently bought a used 2007 400ex. I got a pretty good price on it, and it ran awesome when I tested it. I got home and decided it would be a good idea to do basic maintenance on it, change oil, replace oil filter, clean air filter, cleaned & lubed chain. I completely forgot to check...
  6. Honda TRX
    Hey guys, I just bought a used 2007 400ex off of marketplace from a guy who had no idea what kind of aftermarket parts it had on it. So as I'm fixing it up, I come across surprises every now and than. Anyway, I was doing basic maintenance, and I seen that one side of the quad in the front has a...
  7. Repair & Maintenance
    I have a 2004 400ex. It has a White Brothers Full Exhaust. I have a uni foam air filter on it with the air box lid on. Carb has a 155 main and 42 pilot jet. Everything else is stock however I have the air/fuel mixture at 3 turns as it runs better there than any other position I tried. Everything...
  8. ATV General Discussion
    I have a 2004 400ex and I took the carb off to clean it because it was running rough. I got it cleaned and put everything back together and now it’s idling high (I’ve already tried turning the idle screw down) and seems to be backfiring through the carb. What would be causing this?
  9. Honda TRX
    I have a 2001 400ex bored to a 440 with a wiesco 12.5:1 forged piston, hot rods crank, stage 1 hot cam, sparks x6 exhaust, sparks edition Keihin 39mm fcr carb. the quad started to bog and high rpms then it got to the point where it would bog/miss and any throttle, I've adjusted my valves...
  10. Repair & Maintenance
    Hey, still kinda new to forum. Ive gto an '02 400ex that got a few issues. I previously solved a bad key switch, but now i cant get the quad to run because it wont crank well. Battery is definitely charged, fuses are good, grounds are good. When i hit the button, it cranks over like 3 times then...
  11. Honda TRX
    I just bought a 2001 400ex with some electrical issues. I fixed all the issues but one. It used to turn off by kill switch or turning off the ignition switch but the buttons didn’t turn the bike on so I re wired the wires to the solenoid to work. Ow when the bike is on it dosent turn off...
  12. 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...
  13. Repair & Maintenance
    Hey i'm new here. Just bought a 400ex to fix up the other day, and its got a couple electrical issues. When the key and kill switch are on, none of the switches at the bars do anything. No lights, no cranking, no neutral light. But i can jump the solenoid to get it to crank. I haven't tried...
  14. 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...
  15. Honda TRX
    How do I check if my crank is bad? Checked before split there was no play spun freely. No side to side or up and down just rod moved none from crank. Tore down for shifter shaft and had shavings in the oil.. down to crank n case now.
  16. Performance Modifications
    Hey I have a 250x I would like to put the 400ex carb on it but is there any other engine mods I can do
  17. Repair & Maintenance
    Hi, I bought my bike a few months ago and it was serviced just before I bought it (apparently). Now I have used it quite a bit and want to service it (oil & oil filter change). So I follow the Partzilla guide on youtube. I got the oil reservoir drain bolt successfully (I did struggle) and...
  18. Performance Modifications
    Hi, I recently did a pretty big build last weekend. We did a 440 kit with 10.5-1 compression, stage 3 hot cams, slight porting, full yoshimura exhaust, and no air box lid. Only trouble I’ve ran into so far is the jets. I just bought a 180/185 main and 42 pilot. The carburetor is stock. Should...
  19. New Member Introductions
    Bought my son a 2005 400ex has been running great but now right after a fill up it has a dead spot in the throttle and no power. I check for contaminated fuel and cleaned the carb. I'm lost since it has. Been running great till now
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