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If I go to a bigger high speed air bleed, what effect does this have on the overall richness of the motor? Some say changing the bleed only change the fuel curve and others say going to the bigger bleed will lean it out some.
 

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The simplest way to think about the fuel curve (Air bleeds vs. Main Jets) is to picture a funnel on it's side. The small end is Idle and the big end is WOT. Changing the jets changes the size of the funnel bigger or smaller, while changing the air bleeds will change the shape of the funnel.

Go to a larger air bleed won't allow the engine to draw as much fuel at WOT (in most instances) changing the shape from a normal funnel to more of the of a transmission funnel. So if you're trying to lean out the top end you'd open the HS Air Bleed, but if you're trying to lean out the entire fuel curve you'd do that with main jet.
 
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