when the cylinder head is made for 29 mm carburetor, I think it need larger valves, but what size can be used for street use? -unfortunately there was only one CB650 engine in the workshop, the rest was CB500 engines.
I have read here in the forum that CB550 and CB650 fit spare parts in the gearbox, so I hope that I can use a shifter fork, from one of my CB550 gearboxes.