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Adjusting screw for what? A/F ratio? If it is like the other carbs I have worked on, that will only adjust the ratio at idle to 1/4 throttle. You have open exhaust, right? Is that intake stock? If so, you need to look first to see if you have any air leaks. If the intake is open, and it hasn't been rejetted, you will need a jet kit, or at least some needle shims and a new larger main. I see above that you had the carb rebuilt. Maybe there is something blocking the needle jet? Either way, it sounds like pulling the carb is in order.
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