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Found 8 results

  1. First thanks for any help guys, new to the forums and it's gotten me this far. I bought a 2001 bear tracker 250 for my family to get around the dirt bikes races. It wasn't running right and had a high idle. Previous owner thought it was a carb problem, so he ordered a new Zoom carb and new intake boot, but it still had the same high idle. ( I believe he had the throttle cable adjusted wrong, because it idled fine when I put it back together) So I tore down and cleaned the stock carb, and it started up and idled fine, but needed to have the choke 1/2 out to run. I swapped to the new zoom carb and had the same issue. Choke half out bike ran ok. I played with the needle and the pilot screw with no change. ( bike did seem to be running rich though, but didn't get better when I tightened pilot screw or raised meddle) I Took it to the races and once I started bouncing around in the cattle fields the quad started cutting out real bad. It would barely run. Sometimes it would run with choke off, sometimes choke 1/2, sometime choke full. I cleaned carb again, checked float level, and boots, no change still wouldn't run. Then suddenly it started running ok again. This makes me believe it's an electrical issue rather then carb. I know there's no air leak, it's been checked, both carbs are clean( I've swapped them out a couple times, it starts up immediately and usually idles fine. But then bogs down/ or stutters under throttle. I saw the post on the guy who disconnected his rectifier and reconnected and suddenly it started working again, which lead me to believe it may be electrical and not carb. So any advice on what I should check? Any way to test the CDI or rectifier? Once again, I appreciate your help.
  2. OmarTrx450er-09

    Honda TRX450R Need To Jet?

    MY trx has some mods like an full exhaust air filter and an oil filter my lid is on i bought a dyno jet kit stage 2 i read the instructions and changed the main jet supposibly but i didnt change any fuel needel on pilot jet when i turn on the bike its starts immidiatly but starts poopin and crackin on 5th gear when i go fast >>>?? why ...i feel like the bike should get some moore airshould i remove the lid or what??
  3. marioweldinginc

    jetting with closed airbox lid

    I know Im detuning but its getting annoying riding with an open airbox. I ordered a closed lid cuz sucking in water is not fun. I have the chain drive apart and im waiting for my 13t front sprocket to come in. That should make up for any torque loss with the closed box right? My questions are, while I have the carb apart for its winter cleaning do I have to rejet for the closed lid? It already has a Dynojet stage 2 kit in it. Also should I go back to the colder spark plug (DPR8Z). In there already is a DPR9Z
  4. predrider305

    Help me get started on jetting!

    I was looking into learning how to jet a carb since it seems to be a very important part of the atv world! Found a few good pages about jetting and have a question. How would I increase the jet size on a pilot or a main jet? Would I have to buy new jets or is there a certain procedure to do so on the stock jets? Thanks. P.s: try to lean any replies towards a beginners point of view
  5. I have a 2004 KFX. I am throwing a white bros rd4 slip on for now. I know about the company already lol. I just got a screaming deal on it. My question is this: From stock, how many jet sizes should I go up to get this thing to run correctly? Everything else is stock, engine wise at least.
  6. kfx450r

    Jetting

    Weather starting to get colder..I now hear a single pop when I rev the bike up in idle. And excessive popping on deceleration. Can anyone suggest something for me? I have a 175 main, sparks needle, 2 and a half turns on a/f screw with a 42 pilot
  7. trailblazer_02

    Jetting Specs

    THIS IS DRIVING ME INSANE AND I HAVENT EVEN GOT IT YET, i dont know what i will have to rejet to after i put the intake and CDI on. will these items come with jetting specs? if i call a shop can they help me find out which jets to run? HELP ME
  8. I just installed a new full system exhaust and a K&N filter on my '07 Arctic Cat DVX400.It uses a Mikuni brand carb.I installed the recommended 150 main jet before I started it.(Stock is 130)I started the engine and the head pipe turned orange hot.Is this a sign of too rich?Should I go to a lower size main jet or is there another adjustment/jet that needs changed?

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