Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Have you removed the governor linkage from the governor shaft that goes into the top of the cover?
Take a look at the crankshaft be sure that it is clean otherwise the cover might be hanging up on it. That's the only other place that it might hang on.
There is nothing else that would keep the cover from coming off. You might try turning it a little while pulling it to remove it. There is nothing else internal that would keep it from sliding right off. You could try turning the engine just a little it is possible that the valve tappets may be applying enough pressure on the camshaft that it is causing the camshaft to not slip out of the side cover bore.