PW50 Idle Problems

Discussion in 'Motorbike Technical Discussion' started by hE, Apr 6, 2004.

  1. hE

    hE Guest

    My son's PW has a strange idle problem which I can't seem to diagnose. The
    bike seems to idle OK without him sitting on it, but when he sits, sometimes
    it will idle up significantly, and sometimes it simply dies. I've checked
    his throttle cable for binding, etc and it's OK. I recently had the carb
    apart and cleaned. Anyone had a similar problem?
    hE, Apr 6, 2004
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  2. hE

    Dwarf8 Guest

    Make sure the cable is routed so that it doesn't get stretched when you add
    a body. Did you move it "around" something when you did the carb?
    Dwarf8, Apr 6, 2004
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  3. hE

    hE Guest

    Throttle cable is fine...already checked for binding, misrouting, etc. One
    of the strangest things I've seen in a while.
    hE, Apr 6, 2004
  4. hE

    Dwarf8 Guest

    Okay. Cable is good so it's either air or fuel. As he sits on the bike, the
    angle of the carb changes.
    Next easiest to check is the air filter and crankcase breather hose.
    Next easiest are the line from the petcock to the carb and the vacuum line
    to the petcock.
    I'm betting it has to do with the needle valve and/or the float. As the
    bikes angle changes there is a binding in there. Either the float drops
    (increased revs from overflow) or floats right up (no fuel) and sticks.
    Eliminate the others first as they are visual checks but then I guess you'll
    be back inside the carb.
    Let us know the outcome.
    Dwarf8, Apr 6, 2004
  5. hE

    hE Guest

    Got it!

    The pinch bolt on the carb to engine intake was loose. This allowed the
    carb body to move slightly when weight was put on the frame. It must've
    opened up an air path directly to the engine intake when it moved. Secured
    the joint and voila.

    Man these PW's can be primadonnas!

    thanks for the help
    hE, Apr 7, 2004
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