From what we were always told, pressure pushing the check ball open is more stable than vacuum pulling it open. It really doesn't matter to me, the pressure method works well for me, and, obviously many more people for over 4 - 1/2 decades.
There seem to be quite a few "new procedures" that have come along down the road that aren't outlined in service manuals. Some seem to work, some, like jamming a seal designed to be pinched into place as horizontally split cases are fitted back together, but now forced into a too small seal bore, that have been blown into a "great fix", that just isn't the way to do it right as far as I am concerned. My choice, split the cases, do it the right way. Show me the FDM or service bulletin telling me it is the right way to misapply a seal designed to be set into place by a completely different method.
Then, there are all the different ways to set carb balance. Most manuals tell us to feel the exhaust strengths of all cylinders with their pressures, adjust from there for idle balance, then finger feel the slides lifting from there to set off idle balance. Very primitive, considering there are devices, never mentioned, that work to do those functions far more accurately than the manuals for our bikes state, like the Uni-Syn, and the way I do it (like setting 4 stroke carb banks), vacuum fittings in each carb, and a mercury manometer.
Back in 1972, nobody used manometer to balance carbs, Honda was the only company to use any sort of device to set multiple carbs, and they are, and never were accurate, most didn't read the same on the dial at the same vacuum pull, even with the adjustable dampers they had, but, a manometer, "Carb Stix", works so much better. The manometer were never mentioned in the Honda manuals, nor were jamming an engine seal into a too small pinch set seal bore hole.
It has always been my position that anyone can do it any way they wish, I choose to do a procedure the way it works best, by actual hands on, and common sense experience. Do it as you wish, and let me do it the way it has been proven, by me, the way I have proven to do so, correctly.
I really do enjoy being run over the coals for posting how it does work, insinuate I am either a lunatic, or some sort of liar, when others post obvious attacks, innuendo and "gospel truth" that has no fact at all. It is way past old.
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