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    1639frazier's Avatar
    1639frazier Posts: 4, Reputation: 1
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    #1

    Jul 25, 2007, 06:53 AM
    Briggs 15.5 hp runs erratic at high speed
    Just rebuilt a briggs engine and it runs at low speed but loopes at high. I have rebuilt the carb. Adjusted the valves etc. It spits some through the carb. I set the valves at .006 in. and.008 ex.
    DG's Avatar
    DG Posts: 1,375, Reputation: 109
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    #2

    Feb 21, 2010, 03:09 PM

    Sounds like you could still have a fuel problem on high jet.
    When one runs smooth at an idle and surges on high speed.main jet problem.
    Re check your valves check your manual I thought both were 004-006
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