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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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