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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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