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In some posting on some thread sometime someone asked this question, but I can't remember who, when, where, what, or why. I suffer from CRAFT*; bear with me.

This wee beastie: CV Performance EZ-Just Air Idle Mixture Needle - CVP-EZ001

It has a different taper on its needle such that it opens and closes more quickly per turn than a stock one does. I will leave it to someone else to do the math on the % change in the annular area per revolution of the screw.

30132




*Can't Remember A ****ing Thing
 
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So, in the end, it is a good thing that the KLR650 engine is not very fussy about the exact low speed air/fuel mixture.
Because there are several other brands of externally, easily adjustable low speed mixture needles out there that may have their own ideas about the ideal angle of taper.

So we start with a fully cleaned carburetor, with a work bench base setting of 2 turns out from lightly closed.
With carb reinstalled & engine running and warmed up,
Idle speed adjusted down to about 1000-1100 rpm,
a half turn out or in with the mixture screw, with a few seconds to listen to the idle speed & exhaust note will allow one to sense which way the engine is happier with. :)
 
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