1980 gs550l

hey guys hows it going? Well i just bought this bike gs550l and the carbs were clean and was told the set needle needed replace so i did that and checked the floats while changing the needles and everything seems to be ok in the carbs. But it runs with the choke on and when i turn it off and give it gas it falls on its face i gusse is the best way to describe it. Now the petcock is borke but the put a shut off valve after the petcock but any help or suggtions would be aswome thanks
 
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