I took the cylinder head off and the flywheel is now turning freely. I see a fair amount of carbon buildup on the piston and valves but I don’t see any reason why they would grind or be locked up. The rods, rockers, and springs all seem to be fine. Here are some pictures of it disassembled.
The mower:
John Deere L110
Kohler 17.5hp (CV491s)
Been sitting outside for 7-8 years
Replaced battery, spark plug, and carburetor which had it was running and cutting
The issue:
The mower will not turn over now (a couple days after it was running and cutting)
Relevant information:
Replaced...