Another baffling Tecumseh engine problem on a snowblower
My friend left his 40 year old Ariens, with a 4HP Tecumseh, out in the recent ice storm. It ran well up to that point.
He changed out the gas in the tank and then in the bottom of the carb and it was a no-go. He called me to look at it and I didn't find any water in the tank or the bottom of the carb. The spark plug was wet and I thought that would be the fix.
He called me later and said it wasn't the plug.
I bought it home and suspected that it might be electrical because it attempts to fire and might go 2 revs and then dies. These old units are not easy to take apart to check anything.
Checked the spark with a tester. Jumps a 3/8 gap consistently and bright blue. Point gap perfect, all ignition parts look good. Flywheel key good. Pulled the head and both valves are opening fine and the compression release is working. Didn't check the valve lash because the engine was running fine before this. Took the carb apart and cleaned all the orifices and jets. Put it all back together and just knew it would start. It didn't.
Symptoms are the same. Attempts 2 revs and quits, gasps, and sometimes kicks back like a timing problem. Carb cleaner in the carb doesn't make it start any different.
I can't think of any other exterior motor problems. Coil is under the flywheel. Used my own good gas after thoroughly drying out the tank and carb.
Any thoughts, please?