W9 has a leaner taper. You can tell it is fatter in the picture. I get a better tune out of a W9 then a W7. W7 seems to sometimes have a lean spot on the transition from pilot to main. So you can be rich on idle and rich on main, but get a lean spot on the transition. It always seems like when I am doing a group ride that is always my throttle position.
Re: A35 Polini + 19mm PHBG Race Questions
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