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It depends on what machine you're running even though the principles are the same. Each machine has a certain number of turns to start with on the air screw. There is no such thing as a fuel screw; you're probably thinking of the idle screw which raises the throttle valve when turned clockwise. Turning the air screw clockwise richens the mixture.
 

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Actually some sleds do have what is commonly known as a fuel screw. They are located in the front of the carb instead of the back as the air screw is located.
 

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Originally posted by zackattack
[br]Actually some sleds do have what is commonly known as a fuel screw. They are located in the front of the carb instead of the back as the air screw is located.
Front carb... Rear carb...??

How do you tell which is the front side? Is the front side facing the airbox?

My Air screw is closest to the airbox side, Does this means it is a fuel screw in which I stated in an earlier post that turning the screw clockwise will lean it out instead of richen it.
 

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When you use a direction, it is always as viewed sitting on the seat. Your screw will be on the right side of carb in the back (closest to airbox) is an airscrew. Clockwise richens mixture.
 
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