Honda's V-4 RC30 barely had room in that wide vee for its four carburetors. Point the front intakes forward and the rears rearward? Updraft exhausts in the middle? Or vice versa? The 500cc two-strokes had their exhaust ports face two forward, two rearward, with disc-valve intakes pointing right and left. Or, with reed valves, the cylinders were opened into a vee to allow forward-facing reeds and carbs.