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Join Date: Jul 2006
Location: Kennett Square, PA
For anyone who might be curious - or who might have his/her carbs off and wants to get a good sync - there are a couple of steps to this.
First, turn the idle adjust screw (which impacts front and rear carbs) until both plates are visibly open. In my case, the rear plate was up about 1mm, the front one firmly up against the housing. Turning the idle adjust screw in eventually put the rear plate up about 2-3 mm, front plate up about 1 mm. But at least both were clearly open.
Second, turn the carb sync screw until both plates are about even. REM that the sync screw only affects the rear carb - so turning the screw allows you to adjust that plate back to about where the front plate is. For fine-tuning, place a small item - paperclip, thin wire, etc. - between each plate and the housing, and then turn the carb sync screw until both plates are seated against the object.
Then, once the carbs are back on the bike, sync'ing 'em should be a matter of degrees.