Make sure those orings are in good shape on the screws and also make sure the springs move freely. I like to clean them and then put some marine grease on them. If you turn the screw in, then back it out and the spring does not seal the oring you can get an air leak in the carb.
I would highly recommend talking with a few shops. You can throw any set of A/M carbs on there but to get it to run right you will need to have your prop/pump setup for your motor (porting included). I played guessing games for a year and it's not worth the headache. Novi, Blackjack, and Full...
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