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When a few of us that were techs went to work for Kawasaki, USA, we all worked within and out of both Tech Services and Tech School, no matter the department we were assigned to.
One of the big issues was Mikuni, they made GREAT carbs, but, didn't finalize their settings for liquid level, so, we tested, revised, invented specs that worked. One thing we found is that on float levels, even though one spec is given, that spec might not get the liquid level where it needs to be, and if the level is off, too low, too lean, too high, too rich.
This is why we see some carbs run rich with a specific setting, and lean with the same setting. The point is, it isn't a specific float level, but the actual real world liquid level that makes the whole business work.
I just worked with one board member off board to get this done right, on his H2, and when done, it resulted in a very well tuned and running engine. He did all the real work, built his own liquid level tester, all I did was interject a thought or two here and there as we went along.
Then, straight edge across the carb tops to get them aligned and level, use a Uni-Syn, or a mercury manometer on engine vacuum to set the idle and off idle balances, the key os to get all 3 cylinders running as if they were ONE.
Same sort of thing applies for timing, set the timing lines up with the dial indicator, use a timing light to final set the timing.
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