Ouch! I thought the sync screw was the only adjustment for carb synching. I have been adjusting the low speed jets for highest and best idle and then synching with just the sync screw and leaving well enough alone. Are you suggesting going back and forth between the sync screw and the mixture screws? If you don't mind my asking, is there a better procedure?If someone was messing with them, then yes,
Start with factory recommended setting, but the best way is to do a vacuum carb sync to really dial them in.
Thanks, Ducati. Yes, the full rebuild kits were used. I had free flowing pressurized carb cleaner (from a can with straw) flowing through all passages, or so I thought. Yes, the fuel levels in the bowls were correct- I didn't need to adjust the floats.... The tiny pilot orings are important little buggers to renew, as well.
Did you actually disassemble and rebuild your carbs? Were the fuel levels set?
I think I was in spec there - only about a 1/2" of vacuum difference between the two. Did my reading on 9 inches mean anything, or would we have to have known the RPMs to decipher anything?The correct way to synch cabs is by vacuum readings. Eyeballs are not good enough.
I don't know. It's an old automotive vacuum gauge. It bounced all over during cranking, but was steady while running. As far as sticking; again, it seemed to move accurately when the hose was clamped....
Did you use a modified gauge to eliminate needle bounce or sticks?
I was just trying to make sure things weren't totally out of whack. When I took the carbs off the first time, one mixture screw was 2 1/2 turns off seated and the other was over 5. I had ridden this bike before it went into 'stasis', and the throttle response was very slow and it wouldn't rev very high at all.As an add, valves must be correctly adjusted before any sync. work is done or you are wasting your time.