I'm getting conflicting info. Which way is richer?

 

out is richer

 

Yeah, a few of the sources of info on the style of CV Keihin on our KLX sound confusing when talking about the mixture screw operation. One of them we use the most doesn't clarify when it changes from describing air flow versus fuel flow. Here's a link that better describes that the 4 or so tiny holes in the venturi at the bottom of the throttle butterfly as being actual fuel holes. Air passing in the venturi is pulling fuel out of those 4 holes which lead down into the pilot jet. Some or all of them are controlled by the fuel mixture screw. This clearly means it's metering an amount of fuel that's flowing from the pilot jet circuit and into the venturi.

Keihin CV Carb

 

as usual, more succinctly put