I usually test small engine carbs and atv carbs with a small hand air pump. With carb off in hand and bowl off. Bowl does not matter, but no fuel. Turn carb upside down so float would be pushing the needle down. DON'T push on the float the get needle to seat!!! I pressurize the inlet with 5 psi if it hold just with gravity holding float then needle is good. Most the time they will hold 8 psi but 5 is minimum. Hope this helps.
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