Mikuni all the way for me - only thing Trotta uses. Very smooth throttle response. If you get one order the small chrome knobs that replace those two ugly hanging cables for choke and idle. Only drawback, if any, idle fluctates by a few hundred depending on air temp, so every now and then you have to adjust idle while sitting at a light. Thats why the chrome knobs are good to have. I normally run my idle on high side, around 1100 , so if she fluctuates it wont go lower than 900. It seems to be more efficent wth better milage. Other benefit is it does not stick out as far as a SS, so youre knee wont rub on air cleaner or V stack.