I'm still tuning after 1 year. Plugs are black. I get about 300 miles on the plugs. I've got a blast cabinet so I can clean them easily. I am making progress on the tune though. I don't spend that much time tuning. Using an A/F meter which I couldn't do without. The mains are working well. Stumble in transition. And too rich in Idle. Thats were the black comes from. Thinking of drilling out a 60 Idle jet to 62 or 63. I'm at 65 now. I've been through all the holder sizes. The stumble at transition I'm hoping is a similar problem like "big deuce" had. That I can fix. Right now I'm working on the heat soak problem boiling the gas down the venturis. Been changing the
oil a lot. I've got the 1/2 inch spacers under the carbs but that has not helped. This weekend I'm putting in another relay, switch, and 10 minute timer to the radiator fan. I'm hoping the air circulation for 10 minutes will keep the temp. under the boiling point and not deplete the battery.