My Tecumseh on my log splitter has the exact same issue. I thinks it varnish
and crap in the carb. I richen it up by adjusting jets after its sat for a
year. Then, after a few tanks of hard running, I lean it back out. Running
the machine clear dry of fuel at shutdown seems to help. I've also used carb
cleaner on it many times. Both in the fuel and down the throat.

My guess is you ran it extra hard with that bind up and burnt the cobs out.

Karl