04-27-2015, 06:45 AM
(04-22-2015, 11:24 AM)hondatillthedayidie_imp Wrote: I am very familiar with this condition, from about 1200 rpm through to 3k. it seems as though the throttles are not synced properly. I pulled my bike apart, and the only adjustment I see is the one linking the right cylinder throttle shaft with the left. its not like the traditional four butterfly sync system. I did however notice four screws on the bottom, one for each throttle body. they appear as some sort of mixture screw for the idle air control valve. which makes sense, there is only one i.a.c. to supply all four barrels.
i think i figured it out. i read on here and a few other places that cylinders #1 and #2 have slightly retarded intake cam timing to give the exhaust note that classic sound. all i did was increase the idle screws for cylinders 1 and 2 about 3/8ths of a turn out. this instantly smoothed the idle and now there is no hesitation or stumble AT ALL. again, the screws are located at the bottom of the throttle bodies. no disassembly is required to get to them. pay attention to how much you turn each one, that way you can rectify if needed. only the cylinders with retarded intake timing seem to be affected by the stumble (cyl 1 and 2)
Thanks for the info, I will check this out. I wouldnt have thought there would be a mixture screw on fuel injection, but I hope it works for mine too. It might be a little while untill I get to it but ill let you know how it goes.