I have a Tecumseh HH120 on a Bolens 1257 that has spark, but the engine won't fire...at all, even on ether. I took the head off to inspect. All looked fine...no stuck valves, but the head gasket looked to have a tiny leak. I re-lapped the valves and installed a new head gasket. It has plenty of compression, valves are operating fine. My next step is to inspect/test the solid state ignition module, pin lengths on the flywheel, etc. I know if the pins aren't set correctly, it may fire on the wrong pin at startup advancing the timing.
I was wondering if anyone else has had this happen? I saw plenty of threads with the SSI failing, but none with spark and no fire. Thanks in advance for the advise/help.