Lawnmower revs up and down : LUSENET : Freedom! self reliance : One Thread

My approx 5 year old YardMachine 4hp lawnmower starts fine but the engine revs up and down. I have cleaned the air filter and replace the gas a few times. Could a spark plug cause this?. Not sure what else to do. Any suggestions would be greatly appreciated.

-- Rick Recano (, October 07, 2003


Hey Rick! Try adjusting the screw on the carb to increase the air intake. Sounds like your carb mite have some dirt in it. old hoot. Matt.24:44

-- old hoot (, October 09, 2003.

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