one thing I found out some time after installing my DynaJet kit ... the DynaJet main jet numbering differs from the KEIHIN sizes usually mentioned ... evidently, a 165 DynaJet main is about the same as a Keihin 162 ... I would have thought jets were standardized, but I guess not ... check it out
I agree, thats kind of dum - couldn't they number it by true hole diameter or something like that instead of using their internal numbering system?
Do those numbers stand for anything dimensional??