IMO – If fluid dynamists can keep an F1 car on the ground, I’ll have to say that fluid dynamics is a valid science. If your 150 jet is smaller than you 152, and your 152 is smaller than your 155, and so-on and so-on, then I believe that you’re OK. Your 150 jet may not be the same as the next guy’s, but who cares. You tune your engine with your jets and get predictable results replacing one jet with another. Go with the flow.
And who’s checking to be sure all the pin gauges are the same and accurate?
LAD Specialties customer / tony kart / rotax / kt100