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UPDATE! I disassembled (and carefully ziploc bagged parts for reassembly [The reverse of disassembly!]) and I found the top piston ring had broken at some point. There is some damage to the piston, though it does not seem warped out of shape in any way. I have new rings but the damage affected...

I will keep that in mind. I'll keep the honing tool put away unless it's the last resort!

The compression test I did had it between roughly 35-40 PSI. I have to assume this is the problem as most google results say I should be closer to 90 PSI. I've got a set of piston rings on the way and I plan to tear it down and replace those. I may even hone the bore while I'm at it.

I'll get pics when I have some time this evening but the word escaped me earlier, the cable connects to the interlock. Edit: I also took the 2mins to verify the piston moves when the cord is pulled so I'm thinking it might be spark after all, maybe even though I see a spark its not *enough* of one?

Hello all, new owner of an old mower. I picked it up for $20 at a garage sale, it ran one time once I got it home. I turned it off and it hasn't started since. SN Indicates it is a 1978 model. I have put in fresh gas, tried some starter fluid too. I replaced the spark plug, took the carb off...