If it turns very freely then it can be a stuck opened valve as well check for spark by removing the plug and wile still with the wire plugged in ground against the case wear gloves or use insulated pliers crank the engine look for a spark have the kill switch turned to the run setting in so then check the gas make sure the carb is getting gas if been sitting it may need to be cleaned do to old gas shalac or stuck if there is no spark you may have a bad coil or a kill wire grounding out witch will not allow a spark remove the front pull starter cover to expose the flywheel and check the wires for shorting or a bare one tape or wire crimp for a repair older engines had a points there under the fly wheel and then it will have to be removed for servicing you can check for compression as well by pluging spark plug hole with finger just cover it and crank it should blow your finger off the hole and make a load air wish sound if not you have ether a hole in piston or bad or stuck valve if all this is ok you might have a low oil sensor that's bad check oil and fill as needed if low if good then it should be a 1 wire sensor remove the wire and crank see if there is a spark if there is then that unit needs replacing you can run the engine with out that low oil sensor but you must check it often and tape up the wire so it is not grounding out hope this helps
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