RE:tuning
I was making the assumption that the pilots and mains were already pretty close on the Keihns, then just dialing in with the power jet. Main jet size, imo is not very critical with the power jet installed (as long as it is not too small), imo.
I ran keihns on my 14 mil drilled out to 0.118" and the same ones drilled out to 0.125" (drilled them out by mistake, sort of - long story) and it ran identical e.t.s at the track even though the big difference in the main. Just leaned the needles out, and tuned with the power jet.
I'm gonna run the Lectrons on my 10 mil anyway, but I'm still a hater