I have a lawn mower which suffered in the floods, totally submerged. I have drained the oil (several times until it stayed clean) cleaned the petrol tank and refilled with fresh petrol. Drained all water from within the engine. However the motor starts OK but once warm it starts to smoke (slightly) and revs up and down on its own very erratically. The throttle is auto set as it is a Briggs and Stratton classic.

Stewart Allen, July 2007

Thanks for the replies, problem was solved by my local repairer (Adamsons of Swanland) as the diaphram requied changing. Spot on all now OK.

Regards
Stewart

Stewart Allen, August 2007

carb needs to be cleaned could have some water in it. making the engine run lean

bobby, July 2007

replace the throttle springs on the carb....if its stretched it will cause the motor to run unevenly...bounce from rich to lean....

mike h, July 2007