Thanks to Paul Jameson for the suggestion to solder a piece of brass rod to the idle mixture adjust screw. I found a rod at my shop the perfect diameter to hammer into the screw slot, and successfully soldered it into place. With the carburetor off, I learned that, during my carb "overhaul" I must have never set the idle screw, as I found it to be a good 3+ turns out. Back on the engine, with mixture set at 1.5 turns, the old gal started up without protest. Once warm, I was able to experiment with screw adjustments and found the sweet spot to be somewhere south of the 1.5 turn suggestion.
prior, I had been having to open the throttle some good 3/4 of the way to start, which I knew wasn't right, and even then, took a good 10-12 kicks to get her going. This time, with proper adjustment, the following day, I started the cold engine with a single kick.
Life is good! Amazing how a little screw jet can affect the operation of the engine so much!
Phil Auldridge Austin, Texas - USA
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53 SQ 4 MK II, '72 Norton Commando, '78 BMW R100/7, '79 Honda CBX, 2014 Indian Chief Vintage