I own a later model (super bronco) with the tecumseh single slanted cyl. It is very picky about choking and easy to flood, but a good engine and very easy on gas. Anyway the choke is a two position. This summer it wants one turn over full choke , then choke off or it floods. Removing the air cleaner starts the flooded engine immediately. This may not help you directly but in long run. I noticed there are manuals free on line. The air cleaner is marginal and will let in dirt unless you fuss with it.