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Along those lines, why would the carbs need to be sync'd with a crossover tube? LOL Yeah Id plug them if you are going the vacuum gauge route
Only the Daytonas have vacuum ports for syncing. Older RD's are all mechanical syncing.
I sync twins all the time. Unless they have a port specifically blocked off for vacuum guages, I do the safety wire method:Take two pieces of safety wire (or welding wire) about 8"long and bend them both in half 90 degrees. open the throttle and insert the piece of wire down the barrel of the carb and close the throttle. This should make the slide rest on the piece of wire. Then, slowly turn the throttle watching both protruding ends of wire. When one falls before the other, raise the opposite slide up with the cable adjuster at the top of the carburetor. Repeat until both pieces of wire fall at the same time.It sounds a little complicated, but if you do it once, you will understand it better. good luck!
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