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thanks Frank, I am assuming there was an appreciable gain in performance when you upgraded to 904...correct? That mod has interested me for some time. Do I understand correctly you had Mikuni's on prior to 904 upgrade and it seemed to run better, but dyno revelaed no big gain? Sorry if I missed your point.



i have yet to fully complete the 904 on my bike, and yes i ran the mikuni 42's for one year before stating this project. when this snow is gone i will dyno the bike and see how it does, but i alsy have a lot of headwork done as well. pats carbs seem to work good, i went with these because it was a complete kit and i did not have to do any guessing with jetting, plus to change jets takes about 5 min tops. very easy carb to work on. if you plan on keeping the internals of the motor stock i would just use the stock carbs unless you plan on doing the 904 or bigger. then i would go with a better carb. and yes a dyno showed no real gain, but the overall riding improved leaps and bounds

Frank

(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves NOW-2010 silver and black tbird