Re. the conversions equivalent DynaJet and Mikuni jets, the fuel jets ARE different, per the discussion above. However, the AIR jets for the pilot circuit are identical, that is, the 160 air jet DynaJet supplies is the same size as a Mikuni 160 air jet. That comes from DynaJet, and as measured by me using numbered pin drills.
For the record, the setup I'm at now is:
K&N pods on 34mm Mikuni CV carbs.
Kerker pipe with standard 1.5" baffle.
DJ 138 main jet. (approx same as Mikuni 130, per discussion below)
Needle raised to next-to-last position (#5 position of 6 avaliable. Instructions say to start with #3 midpoint)
Pilot air jet is the DJ #160 (richer than stock, one size smaller than the Mikuni #170)
Mixture screws 2.5 turns out.
This setup is pretty close. I initially went to the recommended DJ stage III settings with the needles at #3 midpoint, but could not get the transition from from the pilot circuit to the main circuit (3000 to 5000 rpm) going well and was getting surging at low throttle settings that the mixture screw alone could not cure, and I was already with a richer pilot air jet. Had to raise the needles two notches (meaning I had to open the carb tops two more times today! Note, I found I could do this without even pulling the carbs. Got to the point where I could change all four needles from gas tank-off to tank-on in about 30 minutes!).
With the above setup, it is mostly good. Overall midrange power is way up over the huge "competition" exhaust baffle and anything the top end lost is not noticeable. Haven't ridden it enough to verify it's good under all conditions, but it is very rideable. I wouldn't have thought the needles would be so influential at such low RPM and low throttle settings, but it was definitely the needles that needed adjusting.
Anyway, there's probably more that I can tweak in these carbs, but it's pretty good for now, almost "Busa-like" in power and desire to pop wheelies. Coming along. Coming along....
I was on a Rally/Camping trip and my morning ritual was to do this about 2-3 times each morning
Dont want to loose that circlip in the pine needles, will never find it and I'm 250 miles from home
). With my 4:2:1 I ended up going back to the 45 Pilots, and dropping my mains back to Mikuni 135's. This is odd ball due to my ported head and the 4:2:1 although I have the 0.340 cams and 1166 pistons.
