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It may also be the belt. Over time the belt stretchs and needs replaced. Additionally and depending on grass height a bigger horsepower engine is the answer. I changed my engine to a lager horsepower and never have this problem anymore
It may stall for many reasons. Is the frass too tall, too thick or the stems are too solid? The whipper can cut most grasses but some are hard grasses that put considerable pressure on the machine that it locks the spinning string feed, therefore stopping it. Other reasons are due to the type of fuel (fixing inconsistencies, too much or too little oil in the fuel or the fuel has been left out for too long and is somewhat a little exhausted. You note this by hard starting. The engine could be labouring because it's not tuned properly. Try starting it and do a manual tune-up. See it stays running at idle and then do some accellerations before it is taken out to cut grasses.
My guess is that the sudden stop has sheared the key that makes the flywheel turn with the crankshaft. (the key is a little sliver of metal that bridges a pair of slots cut into the end of the shaft and the bore of the flywheel. The flywheel is the large metal wheel that spins round on the top of the engine). Since the ignition timing is driven by the position of the flywheel, this does tend to stop the engine working.
The end of the shaft is usually tapered, making the flywheel a tight fit. Conequently, you will need a tool called a "puller" to get it off to put a new key in. Trying to hammer it off instead will just damage the magnets on the flywheel and make matters worse, so don't be tempted.
You mention many PM issues but do not mention a blade sharpening. I don't get on my ZTR without a freshly honed blade installed. "That's" what cuts bahia grass...the blade. You can put all the horsepower you want behind the lade but if you're trying to cut grass with a 2X4 it rips more than cuts grass.
13 to 15 amps electric or battery operated mower may runs slow when cutting thick grass. also recommended not to cut grass when it's wet & need very sharp blade to do the lawn. may overloading it, cutting grass too thick also draws too much power. check house breaker first.