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  1. M

    Backfire/runs rough at high RPM

    Briggs 14.5 hp OHV I/C engine model 287707 on a riding type mower. It broke an intake push rod and I replaced it and then adjusted the valves to the recommenced clearances. Gapped and replaced the spark plug. Changed the oil and cleaned air filter. It sat a few years with old gas in it and...
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