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I know this may sound a little silly but, The guy I bought mine from had taken it to 3 different (fairly well known - reputable) shops. The last one told him he needed a new carb after tearing it down 3 times. I have been working on carbs for a long time and it even took me a few times to realize what he had done. He had gotten the jets switch around, and had the needle installed on top of the holder in the vacc. chamber. If you are pos. that these are all ok, the other thing I found, (and am sure I caused), while blowing the carb out, a plug at the top of the primary jet had blown out. This caused the same symtoms you desc.... Make sure both jets are right (larger jet with needle) and the factory inst. plug at the top of the smaller jet tube is there. after talking to a few people I found out that this plug is very easy to blow out with too much pressure being used. I cleaned the area very well with emery paper and scuffed it with a pick and used a dab of JB weld to fill, and let it set up for about 48 hrs. before reinstalling.