Small Engines (Lawn Mowers, etc.): B ans S 287707 Valves., ohv motor, valve clearance

Question
The engine code is 0225-1. I have it turning real well, its definately getting spark, and with the spark plug out it will turn over all day until the battery dies. Put the plug back in and it stops in one revolution. I did remove the valve cover and tried tweaking the valves a few times but it doesn't help. I'm not sure I'm doing it right, I put a pen in and manually turn the flywheel until the piston is at its highest point, then turn the nut on top of the rocker arms. I have no idea. I can tell you that when the compression stops the flywheel niether valve is actuated.
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Followup To

Question -
Eric, I have a 1995 murray tractor which I use for winter plowing. Its the B/S 14.5 hp IC. It sat for two years and it turns over, but it is doing the same thing it did when I parked it. The flywheel rotates only 1 revolution and stops. You can push it past the point where it hangs up and it goes around again. I recently bought another twin tractor and the flywheel seems easier to advance manually. I tried switching the battery and starter and nothing changed. I took the flywheel off and cleaned and lubed the cylinder and tried evrything I could to ease up pressure on the flywheel so it will turn. Remove the spark plug and it turns a little better, I am not sure I am getting spark, i would say no, because the magnet on the flywheel makes only one quick pass before the flywheel stops. Could this be the valves ? If so how do I adjust them on the OHV motor?

Answer -
What is the engine type code? I will look up the valve clearance.

Do you see the vavle cover on the front of the engine near the spark plug hole?  Removing the valve cover will provide access to the valve adjusters.

Send me the model, type and code number and I will look up the specs for you.
Eric

Answer
To adjust the valves, rotate the engine to top dead center (TDC). You may turn the engine 1/4" past TDC but either way should be fine.

The intake valve clearance should be .003-.005 on an inch.
The exhaust should be .005-.007 of an inch.

You may also want to remove the push rods to ensure they are not bent.  You can use a straight or a piece of glass and roll the push rod on the glass to see if they are straight.

Let me know what happens.
Eric