The pilot screw is the air screw. You aren't calling the idle adj. the air screw, are you? The pilot screw is on the bottom of the carb, covered by a tamper-proof plug. It's the second, round orifice, in front of the carb bowl.
A 4 stroke carb has a fuel screw not an air screw. The circuit is after the slide on the BSR porting mainly fuel. This is an important distinction when tunning. It also has a bigger effect on fine tuning than a 2-stroke air screw. Makes sense when you think of 1 part fuel to 12-14 parts air. A fuel screw multiplies 12X the effect of an air screw. ...I keep looking for field reports of these Big Bore engines and have to pipe in on these things....Sorry!
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