Here's what I know/have done to this point:
[Following Paul Musser's VM-rebuild write-up.] The carbs have been stripped, dipped, cleaned, new cycleorings.com o-rings all around. All stock internals (jets, needles, etc.) Pilot fuel jets 1 turn out. Pilot air jets 1-1/4 turns out. Floats set to 25mm. Bench synced as per the write up.
Dyna S installed, timed correctly to the F marks. Bandit 600 coils installed, getting spark on all four plugs. Freshly-charged battery.
Got the carbs on the bike, spanking new intake boot o-rings installed. Vacuum lines for #2 and #4 installed. Vacuum line for #3 attached to petcock vacuum port. Petcock appears to be functioning properly and flowing well.
In starting the bike (box fan in front moving air past bike):
Primed float bowls, no apparent leaks to indicate stuck floats.
Starts immediately on full choke. Plenty of white smoke coming from 1-2 exhaust side. (Suspect is from cyl. 1, when bike was only running on 2-3-4, no smoke.) Wisps of white smoke coming from behind the exhaust flange on #1.
Bike running until engine warmed up. Good and warm, rpm's begin to surge. When turning off the choke, had to gradually reduce choke or engine would stall.
Finally got engine to run without choke, around 1.1k rpm.
Began adjusting the pilot air screws per the write-up. Richening mixture, no change in rpm's. Leaning mixture, very slight increase in rpm's.
Adjusted #1 through #3, bike begins intermittent "chuff" sound from carb #3. At this point the bike is beginning to stall out.
Stalls out. Won't start without starter fluid, won't stay running. No, the gas hasn't run out...
Help? Places to start looking?
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