I agree with Jon (that statement is a no brainer when it comes to engines), your gonna need to get in there a physically clean it out. Someone said they strip the wire out of a bread tie and use it to poke in all the openings, sounds like a good idea.
Out of everything I've tried, I like seafoam the best. It won't clear out debris, but is good at dissolving carbon and gunk.
While your at it, check the condition of your fuel lines, make sure they are not brittle or too spongy. If so, replace them or they could become a source for carb blocking debris.
Bill
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