Part of your description sounds like carb problems. Hope I am not all wet but have seen some goffy things on my Briggs twins. Those engines have a problem with that NIKI Carb and it is due to the ethanol. They are actually two carburators in one body and they interact with each other.There is a little gasket inside that has four little bitty holes in it. The bottom two swell up and throw the whole carb out of balance. Also the two brass jets have very small "O" rings that disintegrate and cause their own sort of problems. If the key is partially sheared the engine will run VERY hot. Like trying to melt your muffler. That wrinkled washer "William's washer" on top of the flywheel looses its tension after a while and the flywheel can move. I have recommended to several people to buy the replacement carb and they are so cheep but work soooo good! Give one a try. Just make sure you follow the diagrams. That gasket with the little lips on it must be installed correctly. Everything just screws on. Maybe 20 minute job.
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