The symptoms you describe seem to be consistent with an engine timing problem caused by a sheared or partially sheared flywheel key. I thought I had ruined the engine, but a little oil in the spark plug hole after letting it cool and slowly turning it with a long wrench brought it back.) it will probably be best if you keep the mower level so oil does not flow into parts of the engine where it does not belong, After a few minutes the engine rings seized. (I once ran a small 2-cycle engine with a gas oil mixture that was too old. You can try putting a spoonful of oil in the spark plug hole and slowly turning the engine slowly in a clockwise direction to see if it loosens up. You do not want it to start accidentally with your hand under the mower.) If you remove the plastic oil fill tube, is there oil up to the top of the engine casting where the plastic fill tube fits into the hole on the metal crankcase casting, or can you barely see any oil? I am wondering if the engine was run without enough oil and the rings may have seized in the cylinder. If you take the spark plug out, can you turn the engine by means of the mower's blade, or is it very difficult to turn? (Do not turn the engine with your hand on the blade underneath unless you have removed the spark plug.
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