Tony, check to see if there is a second rubber washer between the carb and neck that goes to the head. Just found the same kind of problem so I started to change the carb off of my 91 when I saw a second ring down inside the neck. Took that o-ring and put it on the 58 and the rpm's came up and the leaking stopped. The needle valve started to work like it was ment to. Might just look!!!!