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I got a '91 fomula mx with 470 twin question is what screw is the idle screw and what on e is the low speed jet there is a thumb screw on the side of the carbs and a screw on the opposite side by the "mouth" of the carb that you have to adjust with a screw driver. Which is which?
 

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I got a '91 fomula mx with 470 twin question is what screw is the idle screw and what on e is the low speed jet there is a thumb screw on the side of the carbs and a screw on the opposite side by the "mouth" of the carb that you have to adjust with a screw driver. Which is which?[/b]

The thumb screw is your idle, the slotted one is your low speed air mix.
 

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Discussion Starter #3
thank you I had two different people tell me two different thigs and just wanted to make sure before I screwed something up.
 
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