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Old school VS new school carbs

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Just wondering, I have an old fourstroke XL250 with a rould slide 32mm Mikuni on it.  It uses a air screw to adjust low speed mixture.  Now a days 4strokes use fuel screws to do the same thing.  

 

Why?

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If it's a pumper carb it has a fuel screw.

If it's a non pumper carb, it can have fuel or air.

If it's a CV carb, it can be fuel or air.

 

Older carbs do not have separte Main air jets and Pilot air jets.

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But why?  Since a F/S is located on the intake side of the carb and a A/S is on the filter side; was this done for better throttle response on 4strokes?

 

Not sure what you mean when you said:

 

Older carbs do not have separte Main air jets and Pilot air jets

Edited by WFO_Pete

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