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Still messing with this. Turned out I had a bad gasket which was letting in a fairly severe air leak that was messing me up.
Now that that is fixed, however there’s still something strange going on. I checked the linkage rod and made sure that at stop the throttle plate was all the way closed and at WOT it was all the way open.
Strangely enough, at WOT, adjusting the low-speed needle gives me more results than the high speed needle. There is a little bit of a sweet spot that lets me get the motor down to about 3/4 throttle from WOT, but outside of that spot I have literally no adjustment.
The low-speed needle does seem to like being adjusted out 1.5 times, while I can’t seem to get any real changes from the high-speed.