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At the risk of revealing my embarassing ignorance about motorcycle engines, what is 'carb synching' exactly?
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A little more detail... Synching is adjusting the throttle butterflies so there's equal flow between the individual carbs and cylinders at an idle.
You do that by adjusting the butterfly positions and measuring the vacuum on the exit side of the carbs. When all three vacuums measure the same, the engine will idle at its smoothest.
It's an important part of setting up the idle and in part determines the smoothness at small throttle settings regardless of rpm.
Unless the synch is horribly off it has little effect over about 1/4 throttle.
Jim
