Problem solved
A brand-new NGK plug was no good.

When I tested it I did the standard "rest it on the head" trick, which produced a blue spark. But I didn't look closely enough at the PLUG. I suppose what I saw was the blue spark between the plug and the head, NOT between the plug electrodes. But since it was a NEW plug, I did not assume that it could be bad.

Ya know what they say about ASS-U-ME, right?

Anyways after the folks on the forum agreed that it is possible for a new plug to not function correctly I went home and simply moved #2 (new) plug to #3, and #3's to #2. Lo and behold the problem followed the plug and #3 was not firing. Put ALL NEW plugs in and it runs great.

But sonnovabeetch that was frustrating. Those BR9ECS plugs are like $7 each too! But in the long run, the problem was a bad plug. Cleaning the carbs has made the sled a lot easier to start, but really wasn't the problem.
Thanks for everyone's help and opinions on this!
Jim