Re: carburator synchronizing
Yes, synchronization is quite important as per mentioned in your service manual.
Make sure that the throttle linkages between all carburetors are set so that at idle, all butterflies are closed AND just start to open ALL at the same time.
Assuming that nobody has changed the distance in the linkage between the vertical throttle arm and the nylon yoke that is attached to the the cam that opens the throttle via the throller roller.... simply make sure that throttle just starts to open when the scribe mark on the cam is dead center with the throttle roller. That's it.
If the distance in that nylon yoke arm assembly has been changed, then you'll need to set the idle timing as per your manual.... cam scribe mark aligned with enter of roller at 2 or 3 degrees, whatever it states in the manual.
