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Check the speed control and ensure throttle closes fully and adjust as necessary; also check for leaking carburetor mounting gaskets or loose bolts. Turn needle valve clockwise until it just contacts the seat and then turn counterclockwise 1-1/2 turns and start engine. Let it warm up and turn needle valve clockwise until engine slows (lean mixture), then turn counterclockwise past smooth operating level (rich mixture) then set needle valve at midpoint. If problem persists, remove carburetor and disassemble and clean with carburetor cleaner. Then re-do the adjustments described. Good luck.

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Q: My 11HP BriggsStratten lawnmower wont start Its getting spark and gas When turned over there is a fairly rapid backfiring ANY SUGGESTIONS?
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