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Message: [QUOTE="2strokerfun, post: 1402741, member: 69719"] Replaced the Keihin on my '76 Honda elsinore 250 couple of years ago with 36mm Mikuni because the needle and needle valve were just worn out and all the jetting in the world wouldn't stop the old carb from running blubbery rich any longer. Been generally pleased with it, but have been chasing the perfect jetting off and on for two years. Finally tried a double taper 6DH7 needle on Sunday and thought I had found the perfect "magical needle" for this application. Started on middle notch of needle. Smooth power delivery, not a hint of either rich or lean. Perfect plug chop and no hint of detonation no matter what I tried to do. It was a crisp 68-69 degrees when I did this. I was happy and smug!! So I go to take it out yesterday, at 88 degrees and once again I have a hiccup in the power delivery. A rich spot, I believe. I didn't have time to try lowering the needle a notch and see if that cured it. I'm hoping it would. Maybe a 20-degree difference is more significant with this carb than what I am used to dealing with. Not particularly humid either of the two days. I've been told the round-slide Mikunis were more sensitive to temp/humidity changes than the old Keihins. I expect to make a main jet and/or needle change between 90+ degree weather and 50- weather, but never really thought I'd need to make a change for 20 degree difference. Not a big deal to make a needle setting change (on this bike, I don't even have to rotate the carb to do it). But I'm still miffed whether I'm still chasing the perfect carb setup or not. Anyone have any experience with the old VM Mikunis that could let me know if that is what I'm looking at or am I still maybe chasing the perfect jetting and Sunday was a fluke? Thanks! [/QUOTE]

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