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If it runs better with the choke on what is going on is the carb has a little bit of debris in it, and it is just starting to show the signs of clogging up.
All engines need a specific ratio of fuel to air. To much or to little of either and the engine runs poorly. On your engine there is not enough fuel because of the clogging. So when you choke it, what that does is it restricts air, which brings the overall fuel/air ratio closer to where it is supposed to be. If the carb was not clogged, choking it would make it run worse, not better.
The fix is going to be to have the carb rebuilt. On the smaller ones they are impossible to get clean by hand, and they need to go into an ultrasonic machine to get them spotless on the inside. The way I do them in the shop is first they go in a parts washer to knock off any external dirt. Followed by a hot water rinse. Then I disassemble the carb and remove the fuel jets, throw all of it in a heated ultrasonic machine for 45 minutes. Pull it out and give it another hot water rinse. Blow everything dry with a blow gun. An then reassemble with a new carb gasket kit.
That is the problem and how it gets fixed. Does that all make sense?
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