RL... I think I got the Magnetron, mine is old but not that old! Yes I tried draining the bowl as well, suprisingly no H20...
I had a Techumseh that never ran right....wouldn’t idle. I took the carb apart many times, until a guy told me about a crossdrilled passageway that needs to be cleared.
Once I found it and ran a tiny wire through it...it ran like a top. But that was before the alcohol fuel came to Maine.
You should always have been able to get avgas at your local small airport. Just get a gallon and see if it fixes the running condition. If it does, you may be able to mix it with your regular gas as an additive (develop your own blend) as it is pretty expensive to use straight.