I'm building a diorama with a custom, caferacer style, build of the tamiya CB750F in 1:6 (model 16020) and i wanted to use the real link chain (12674) from tamiya that was designed for the Africa twin so there are no chain gears avaible. in the packet are 6 wheels: the large one in the same design like the one from the kit with 3 different teeth numbers (41 / 42 / 43) for me the 43 fits the best. the small one with a oin to glue fixed in place and with a center bore for a 2mm screw to make the chain movable (you will need a 3mm glued support on the engine) as well both with three different teeth numbers, 17/18/19 here the 18 worked best. but it depends a bit the paint thickness.
Check my other designs for the CB750F and i will make a collection too.
if you have questions just write me i will answer everyone as soon as possible!