T & B, your best results is to use the liquid you are going to use in the system at the pressures you plan to run. In other words, your bike can be part of your test bench. Just be careful. I would suggest baby food jars to catch the fuel. You should be able to do a 30 second test spraying fuel without overfilling. Don't allow any dripping after your release the button if possible. Weigh and number all of them, race gas will erase Sharpie, so be careful. Weigh each container, subtract jar weight and you have the weight of the fuel spraying into each cylinder. Running N20 test about the same, weigh the bottle, run 1 jet at a time for 30 sec, re-weigh, difference is the amount of N20 going in.
If you are very very lucky, the weights will be close to the same. Converting everything to Pounds per Hour will help with perspective. Try to put together matched sets of jets for quick change options. Have fun, race season is only several months away.
Joe, syringes are a good idea also.... you were typing while I was