hey bruce, you may be right about that top end. I was planning on doing one after the Adelanto GP, which next week. The jetting in the bike right now is 48 pilot, R1470D needle, and 185 main. I checked the plug and it is definately rich. I emailed Langston Racing and got a reply back from Gerald Langston, he said the the Doma pipes like to run rich and to start with stock jetting and lean it out one size at a time. The bike feels blurby down low, about 1/4 to 1/2 throttle. I'm guessing that I will mostly need to lean out the pilot jet, but I might have to lean out the main jet also. I'd like to ride sunday if you can. I'll go out and buy pilot and main jets a few sizes leaner and maybe we can mess with it.