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I cleaned the innards with some carb cleaner, oiled some things, put it all back together, recharged the battery and now it runs. I have no idea what I did, but thanks for all the tips.

It meaures 12.7v with the key off then drops down to ~9.8v when I try to start it. But it still spins better than it did before - probably because I have the carb. and valve cover off. I guess I need to buy a new battery

I can spin them but only when they're open (the exhaust valve is a little tougher). Is that the way it's supposed to be?

An ohm meter or a voltage meter? And how do I check the flywheel key? Do I need to remove the flywheel for that?

I checked the valve clearances and they're good per the manual. Anything else I should check?

Can you recommend a link with good instructions on how to do that? Most of the stuff I find online is for overhead valves

I have an old 28D7070123-01 11.5HP engine on an MTD riding mower. When I try starting it, the flywheel only turns part way then stops. I also hear a wheezing sound that sounds like pressure being released. I tried starting once with the sparkplug removed and the the flywheel rotated normally...