Check your spring
There were so many different needles and springs used throughout the 4 decades of the late model carburetors that a problem emerges when someone uses an earlier (smaller diameter) spring with one of the later needles.
The proper dimensions are: ID is just under ¼” and the uncompressed length is just over ½”. Turning the factory needle in against the seat, the spring is not quite fully compressed. There is a small shoulder at the outer end of the needle which the spring slips over.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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