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Just as a point of interest, the factory pro documentation recommends raising your float levels slightly when getting into larger jets (1-2mm). This is to allow for the extra demand on the carb under heavy load, WOT. I believe this is to prevent the straws from cavitating when demmand is high. Why would they recommend this if all it does is effect the low end and create a rich idle. It's not vacuum that is pulling fuel into the cyl, it's air pressure rushing through the carb as it tries to fill the void created by the fall of the piston. In this regard it works like a paint gun, the air rushing by picks up paint as long as the pickup tube (straw) is submerged. Does a full paint can paint richer then one that is half full? Or does it remain consistent until it cavitates when near empty?
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