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I wouldnt ever need one.. the only time I use flat slide carbs is on Case reed 2 strokes with a power valve... a 4 stroke would carbrate better but it isnt needed
Ron Wood Racing is offerring a Mikuni FlatSide TM45 carb as part of their Stage One DS650 Kit. They say The stock vacuum operated 42mm carb has a butterfly restricting the venturi to give an effective size of 38-40mm, and can't be enlarged easily.