you need to buy a compression tester or have an automotive repair shop or lawn mower shop test it for you. glue could be a problem, but i doubt you got that much into the carb. and you said you cleaned the carb.
my bet is on the loose intake manifold, or a loss of compression from being underjetted. maybe the oil pump failed? we're not going to be able to help much without any compression numbers and info to work with. its all just guesses right now.