Vintage and Classic Hondas

Getting nowhere

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Peter t

Getting nowhere

I need some help. I have a 1978 cb 750 k, I put a 1976 engine in it. I don't think that I am having a compatible issue, but here is my problem. I just cannot get this bike to fire. On the coils there are two wires, one blue and one yellow. With mine I have checked, and am getting power to the coils. The problem is the yellow wire fires a timing sequence, but the blue wire does not. The blue wire as a matter of fact, delivers constant power with the ignition on. So the situation is 2 and 3 should fire correctly, but 1 and 4 do not. Can anybody give me an idea as to why this is happening.

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Re: Getting nowhere

Administrator

Do, you have the stock points, or has it been converted to an electronic ignition?
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
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Re: Getting nowhere

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In reply to this post by Peter t

Have you verified the point is opening? If it does not open, it will not break the connection to allow the coil field to drop and create spark.
Same basic thing if you are using an electronic ignition. The module for 1.4 is not triggering.

With the points, it is likely just an adjustment issue. With the electronic, it could be adjustment of the module could be bad.

The ride IS the adventure. The destination is just to get gas!