Bad coil or spark plug making it run on one cylinder. You can not hear the difference but your will notice the lack of power. The fuel your smelling is unburnt fuel from the one cylinder not firing. This is a common thing to happen. I would start with new spark plugs. Running the mower at less than full speed will foul the left spark plug on some models of the Kawasaki motors. They are tuned to run at rated HIGH idle and less than that makes the left cylinder run rich and will foul the spark plug on that side.
Had this issue real bad on the JD LX188 mower with older owners that refused to run them wide open while mowing. Their running the mower at 1/2 to 3/4 throttle was actually harder on the engine than running it wide open.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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