Question about Yamaha XJ 650 Motorcycles

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My bike just got the carb rebuilt and when i try to start it up it wont start unless i spray starting fluid in the carb. then after it starts it idels for 2 mins or so then stalls,and when it starts up again it will run for a couple seconds and wont idle it just stalls out. i have to give it gas to keep it goin.

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  • nneffs9022 Sep 29, 2010

    thanks dude it helped but now after it starts and you get going it keeps backfirein and the throttle seems like its sticking and revs real high.

  • nneffs9022 Oct 01, 2010

    thanks dude but now i have low compression on my right side and i dont got a clue what to do now.



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You could have a couple of things wrong. It could have a vacuum leak. The best way to find a vacuum leak is to get it started and use your starting fluid and spray around the carb. If the engine revs up, then you will be able to find the vacuum leak by where you spray. Another thing could be the idle screw was adjusted out and not idling high enough. Or could be that when they rebuilt the carb, got some of the debris out of the float bowl in one of the jets. I would start by checking for vacuum leaks and set the idle up a little bit. The idle screw is on the side towards the top of the carb. It will have a spring on the screw. It doesn't take much to change the idle.

Posted on Sep 28, 2010

  • Rodney Clark
    Rodney Clark Sep 29, 2010

    You may need to take the throttle slide out and lube them with some motor oil. The throttle slide will unscrew off of the top of the carb. They get dry and don't slide as well. Also you may have to adjust the idle a little after the bike warms up.



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