Interesting model....550 bottom end/gearbox etc with 500cc pots...??
The 77-78s cb 500/550 k3-4 model differencies are confusing If anyone knows about it feel free too enlighten me.
I have read here on the forum that K3 was available in Europe in 500cc form,
only the cylinders,piston kits and carb jets and of course the side cover emblem
are different to the 550 everything else is same as 550K3
also the CB550K (4?) 77-78 looks too be very similar.