600r ninja, strange problem.
I have a 1986 zx600r ninja, that I've been working on. I tried to sync the carbs but the needles on the tool were jumping back and fourth. I assumed it was timing, but now that I can see all the marks right now it seems to be on time. I'm going to check into more detail on how in time it is. But if it's not on time, what else would make the carbs do that?