Yeah, Im one of those other people that fricken wasted a bunch of my time with the dyno jet kit. Dont waste any more time is all that I can say. You will never get the thing running right. The right way to do it, is return your crappy dyno jet kit, go down to your yamaha shop with $30 and buy a 165, 168, 170 ,172, 175 main keihin jets, a 45 pilot or a 48 pilot if you have the cam mod, a YZ450 needle (which happens to be the same as the one that comes in the gytr kit for the yfz). All that probably wont even cost that much. What you will probably end up running, at 1600 ft, is a 170M, 45P, yzneedle on 4th pos. and start out with 2 turns out on the mixture screw. Thats just a guesstimate, but its somewhere to start.
Dont bother trying to compare dyno jets #'s to any other type of jet, cause they are all different. Even mikuni and keihin's #'s are a little different come to find out.
Bottom line, dyno jet kits for the yfz450 absolutely suck, and do not work properly!
Good luck!
