Ok, its been a bit since I have updated my progress on this, been on some family adventures and haven't had much time with the bike. So I've been playing around quite a bit over the last few days and after some miles with various tunings I am getting a feel for whats working and whats not with these carbs. Currently I am running 132 mains, 42.5 pilots, needles set in position 1 leanest setting, mixture screws are about 3/4 turns out. This combination is giving me a nice light brown color to my plugs and for all intensive purposes the bike runs fantastic... except during 3/4 throttle rips I am still getting a very slight hesitation as described early in my posts. I was surprised to find that going to needle position 1 actually reduced the hesitation substantially, to the point where it is almost completely gone. If I jump to position 2 or 3 the problem gets noticeably worse. I had another thread going discussing the use of a gas analyzer to help with my tuning and for reference purposes I have found that running a CO content of about 6.5 to 7% is required to avoid lean backing on deceleration. This boggles my mind a bit as in the car world thats considered way to rich but the proof is in the pudding, if I drop it to 5% or lower I get instant backfiring on decel.
So this is where I am at, all my real world first hand experience with this thing is telling me I still need to be a slight pit leaner on my needles but I am at the leanest clip position on my current set, I guess I need to order leaner needles? or is there an alternative way to lean them out? I have tried dropping my main jet to 130 or 127.5 but It doesnt seem to help the mid range hesitation and my full throttle power starts to suffer. Does this make sense? It seems a bit weird considering I'm up 100 cc's on this engine, but I do live in Calgary at 3500 feet so maybe thats factoring it to requiring the leaner fuel mixtures?
