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Interesting testing,,,Water has surface tension, try the test with someting added to the water to eliminate surface tension or a different liquid.....Maybe gasoline?
I used a similar method for measuring the flow through a Griso throttle body only I used a constant head of 500 mm timed to fill a 500 ml container. its very repeatable.
Being a statistician and thus a great fan of belaboring the obvious
The Statisian's blues:
...How conclusive can the flow rate be with no metering needle in the jet...? I know that is picking nits however, the flow of the jet alone without the influence of the needle in varying positions surely cannot be said to be a standard, can it...?
In a situation where a very large increase in the main jet size is required, remember that the main jet flow cross-sectional area should not exceed the effective area for fuel flow between the needlejet and the tapered-needle tip. Check this with the following formula:...
... I believe my results are even more repeatable (have a smaller coefficient of variation) than yours, though I'd need to look them up.
...Which other jet was one of the old, worn jets besides the obvious #3..?