Hm. I went to a 25 pilot and a 95 main (stock is 25/90) and things have gotten a little better. Yet, it's still rich.
Spitting back has been greatly lessened but it happened, weakly, once or twice today. Starting can now be done with the enrichener engaged, but requires some throttle to be added. Same without the enrichener, but less throttle obviously required.
Did a plug chop at a very low speed then took the plug right out; came up with what I thought was oil on the plug and I got worried. After a short ride around the 'hood at low speed, I waited a few minutes to pull the plug; it was sooty and insulator was very dark brown. No sign of oil. So I am assuming that the blackish liquid I first saw was just carbon that had come straight out of the still-very-hot-engine. Carbon residue on guns is liquidy at first, so I'll make the bold assumption it's no different from an engine.
Still, don't know why I'm so rich, but a turn or two more out on the air screw might cure that. Or should I be looking to another cause?
Float height is good. I pulled the enrichening plunger from the top and cleaned it, too. Is there anything else in the enrichening circuit which could cause it to feed extra fuel to the carb even when the choke lever is disengaged?
Just seems odd that I'm on stock pilot jetting and still rich with a K&N filter and an open header/megaphone exhaust.
Idle is still a little lumpy but I've been able to get it smoother. It's been a challenge adjusting the pilot mix because the beat was so uneven it was hard to tell when the bike was reacting to the mixture change instead of just another seemingly random fast or slow point.
Thanks for listening...