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Join Date: Jul 2006
Location: Kennett Square, PA
Jon Landau (93VN750) was able to get a t-fitting to run between the manometer and the vacuum line/s, and so could run the bike as needed, turn it off, turn the sync screw, run it, etc. I couldn't find the right size t-fitting, and so have been running the bike for a couple minutes to ensure the bowls are full, then disconnecting the vacuum lines, hooking up the manometer, running the bike off the fuel in the carbs, syncing, running, syncing, til I run out of gas; then hook up the vacuum lines and run the bike again for a couple of minutes; then back to unhooking the vacuum lines and hooking up the manometer. This works ok, if only because it's readily apparent when there's a difference in vacuum, and so you only have to run the bike for a sec to see if one cyl wants to pull all the fluid its way.
Oh, and the petcock should be on "On" throughout the procedure.