Hi from Australia. The CB750 K0 Has always had some misunderstandings.. In the US market CB750 went to VIN AND ENGINE Nos CB750-1044649 CB750E-1044805 in US service bulletins refured to as pre-K1..Now this is where the trouble started In the US Market The K1 was introduced at CB750-1044650... In Other markets around the world the K1 was introduced later...Here in OZ we got K1's at VIN CB750-1054244...These bikes were in all other markets than the US with VIN's from CB750-1044650 to CB750-1054243 Here in OZ and later in some markets, True K0's These where a transition model they had all CB750 pre K1 fittings EXCEPT THE CARBS were the K1 LINKAGE TYPE. these bikes were refered to here as a K0, I have seen these in the Aussie, UK and Jap markets and may be others. Hope this throws some light on this very confusing point. at around 10k production a rare bird...