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Make sure there isn't anything binding the deck belt or blades. Check the spindles for free movenent. If all that is good then it might be the linkage that is supposed to adjust the throttle when the engine is under load or it might be a carb issue...especially if you run ethanol gas in it.
This most often happens when you are mowing too much grass at once, or when the deck (or chute if you have a bagger) is clogging for some reason. Sometimes this is made worse by having dull blades. Usually mowing at a slower speed or mowing more frequently will help solve this. If the motor is struggling with the blades, these are usually the culprits. Clean your deck thoroughly, cut the lawn more often, or cut it slower.
In some cases, if your PTO belt may be worn, stretched, or need adjustment. When this happens, the motor will not slow down with the blades but will keep running normally and you may smell a burning rubber smell as the blades slow down.
Two things come to mind. The brushes in the motor should be replaced. (Get them at a local motor repair shop, but take one of them in with you to get the correct one). If that is not the problem it may be the switch in the handle that you turn it on and off with. The switch may be corroded or bent. Good luck...Lee
sounds as though you are on the right track
but be sure to check the wiring directly from the electric clutch on the front of the motor back to the switch
a wire could be pinched in the frame and shorting out intermittingly
look around and find those wires and move them around and look for chaffing and tightness
and what you could also do is to unhook the clutch at the connection to it at the front of the motor and engage switch and ride around and see if fuse blows and if not you may have an electric clutch issue