Lawnboy 10313 no compression Help

i picked up a 10313 Lawnboy which looks to be in great shape but has zero compression. The mower has been sitting for a long time per evidence of nasty gas and one of the worst carburetors i have ever cleaned/rebuilt. I am going to try the oil in the plug hole as a last resort before a disassemble. any other things. Piston and valves do seem to be moving correctly.