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    Sudden over revving Briggs and Stratton

    I have a Craftsman lawn tractor, 21 hp Briggs and Stratton, model 331877-0869-g5. Was mowing and all was good, pulled into garage and engine started revving at high speed. Have started a few times since, always goes super high rpm, the outside governor arm doesn't move, but I moved it by hand...
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