Thread: DR350 Thread
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Old 01-05-2013, 02:10 PM   #14089
motolab
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Quote:
Originally Posted by jmderyke View Post
Then when the bike is warm adjust it, so if the engine idle goes up it likes it and then turn the idle knob down, ajust the a/f screw to best running conditions.
Quote:
Usually CA model carbs have the air/fuel screw blocked off so you cant adjust it, nothing a drill cant fix lol
The most proper way to refer to the idle mixture screw (aka pilot screw) on a BST carb is as a fuel screw, as it does not adjust air and fuel simultaneously. There are things called air screws on carbs where you adjust the idle mixture by changing the quantity of air being bled into the pilot circuit. The reason this is important is that a fuel screw makes the idle mixture richer by screwing out and leaner by screwing in, whereas an air screw makes the idle mixture richer by screwing in, and leaner by screwing out. Fuel screws are usually on the downstream side of the slide, and air screws are usually on the upstream side (although I have seen occasional exceptions).

Regards,

Derek
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