Small Engine Troubleshooting Problems? Ask a Mechanic Now.
If you remove the spark plug and ground it , do you have spark? If it has spark, put a teaspoon of fuel into the spark plug hole, re-install the spark plug and see if it will start for a few seconds. If you get no start, the flywheel key needs to be checked, as engine may be out of time from a sheared flywheel key!
Have you removed the spark plug and held your finger over the spark plug hole while you crank it, to see if it has enough compression to move your finger. If not, you may have a stuck valve!
But does it have compression? Spark, fuel , compression, and timing , and it should run, if the fuel s good.
You say the piston is moving? Then you have a stuck valve, that is not seating.
Valves are in the cylinder head, Head has to be removed to free up the valve or replace it!
Flat head design, head has to come off, then valves can be removed with valve spring tool. You may be able to reach in the valve spring hole and flip the valves, may free it up!
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