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carb not working till reach 4000 rpm

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    carb not working till reach 4000 rpm

    When I was repairing a small 400cc Yamaha (XS400) I discovered that a kit I had bought from MikesXS had a needle and seat for the float bowl that would not sit down and seal. They had a small wire hook on the top that would not allow the needle to touch down in the bottom of the seat. I had to pull them apart a half dozen times before I sucked on the gas inlet to see if there was a leak. Lo and behold I was able to pull air easily.

    Now all my carb rebuilds include a suck on the gas line to see if the float seats have a good seal on the needles.

    The symptoms were: would not idle... would only run above 4000 rpm.

    Hope this might help a few out there.

    mike...
    mikestp@yahoo.com
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