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Remove the spark plugs. Inspect the tips to make sure that all are tan, and they do not show any signs of metal on them. Try to turn the engine over with the starter. If it still will not go, remove the guard from the coupling between the engine and the jet. Use a strap wrench to try and rotate the engine. If it is not east to turn or you feel some grinding, the engine will need to come out to be overhauled.