The KDX top end is originally designed for a 35mm carb, since we want top end grunt we went for a Keihin 38mm PWK Air Striker Carb
A = 46mm, B = 63mm, C = 91mm, D=171.6mm (from Keihin website One issue that had to be resolved was throttle travel not allowing full throttle, as we now have a carb with a 14mm larger throat that the original PX. This was resolved by trimming back the throttle stop, so the cable travels further. Another moditifcation is an angled top cable entry point. With the original (below), the cable will hit the side panel.
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