Topic: CB750 Engine year compatibility: 1972 into a 1976 K6?

[Raymonty]

Well, I found a donor transmission (from a 74 cb750)for my pooched CB750 K6 transmission, just taking the donor apart and inspecting/cleaning it as well as practicing putting it back together blindfolded (not really), however, I may have found a full working engine from a 1972 that I could potentially just drop in so I can keep riding while repairing the original. Ifof course, the 72 is comparable. Does anyone have experience or insight into that....does a 7s have the same connections/attachment patterns/ratios as my existing K6. Thanks in advance

[flybox1]

Yes...toss it in.
I had a '71 in my '78

[bryanj]

You may have to transfer the exhaust to head fittings otherwise all ok, ratios may be different slightly