K-Series Classification by Engine Number
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Trying to figure out which series engine you have?
Here's an excellent chart which details the classification of K0 through K8. Now you know!
Model
Engine
Frame
CB750
1000001~
1000001~
CB750 K1
1044806~
1044650~
CB750 K2
2000001~
2000001~
CB750 K3
2200001~
2200001~
CB750 K4
2300001~
2300001~
CB750 K5
2372115~
2500001~
CB750 K6
.
.
     US
2428762 - 2465510
2540001 - 2575894
     Canada
2428762 - 2465992
2540001 - 2576394
     European Direct
2438827 - 2475324
2556099 - 2584973
     France
2438827 - 2474663
2555545 - 2584393
     Germany
2438827 - 2476626
2550437 - 2586393
     England
2438827 - 2475216
2573735 - 2584843
     General Export KPH
2438827 - 2476422
2573735 - 2584843
     Australia
2438827 - 2476604
2578674 - 2586269
CB750 K7
.
.
    US
2700009 - 2729740
2700009 - 2729532
     Canada
2709652 - 2728188
2709636 - 2728111
     General Export KPH
2720001 - 2740319
2719942 - 2739004
     General Export MPH
2732065 - 2732824
2731270 - 2732029
     England
2719995 - 2736452
2719935 - 2735472
     European Direct
2720004 - 2740102
2719941 - 2738818
     France
2719999 - 2738337
2719939 - 2737053
     Germany
2719997 - 2737988
2719937 - 2736904
     Australia
2720003 - 2740319
2719944 - 2739038
CB750 K8
.
.
     USA
3000001 - 3062980
2800001 - 2862980
     Canada
3001934 - 3061938
2801946 - 2861935
.
Source: www.sohc4.org (now defunct)
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