EE hlep needed
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Thread: EE hlep needed

  1. #1
    Senior Member Bill H's Avatar
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    EE hlep needed

    I have a 1978 Honda cb 400a. Can one of the members explain how the ignition system works. Its not like anything I have worked on and I would really like to understand whats going on.

    Thanks Bill

  2. #2
    Senior Member doode's Avatar
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    You mean the cdi box? You can google cdi and motorcycle and get tons of info

  3. #3
    Super Moderator J-T's Avatar
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    Simply stated the ignition system is separate from the rest of the electrical system. The stator has a separate winding that powers the ignition system. The CDI box has a black wire with a white stripe which is connected to the ignition switch and kill switch. Turning the ignition switch off or turning the kill switch to either of the off positions provides a path from that wire to ground effectively "shorting out" the ignition and shutting the bike off. That's why these bikes will run just fine without a battery.............well..............except for the getting it started part.
    JT
    81 CM400T Under re-construction
    82 GL500

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  5. #4
    Senior Member Gixxer-18's Avatar
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    This is from the FSM.
    EE hlep needed-img_7043.jpg
    EE hlep needed-img_7044.jpg
    EE hlep needed-img_7045.jpg
    EE hlep needed-img_7046.jpg
    HTH
    Nigel
    2002 GSXR1000
    2005 R6
    2003 R6
    2003 Hyosung Comet 125
    1983 CB250RS
    1979 T140E Bonneville
    1976 CB360
    1975 T160 Trident
    1974 CL450
    1972 CB500/Four K1
    1972 CB350/Four K1
    1972 A100 Suzuki
    1957 T100

  6. #5
    Super Moderator longdistancerider's Avatar
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    The CB/CM 450 FSM has a good diagram, can't figure out how to copy and paste it here
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

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  7. #6
    Senior Member dtsmjr8dan's Avatar
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    Jim, last time I tried to do that, I had to 'print the current page', scan that page back to a file on my puter, then post it.
    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

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  8. #7
    Senior Member tepetit53's Avatar
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    Here's the CB400A wiring diagramHonda CB400A Wiring Diagram.pdf
    Ted

    '79 CM400T
    '09 ZX14
    I don't text,
    I don't tweet,
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    and I don't 'like' anything

  9. #8
    Senior Member dtsmjr8dan's Avatar
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    Is there anyway you can post the actual illustration on here rather than a link, Ted?
    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

    T-shirt sales supporting 66Sprint's LSR Build http://www.hondatwins.net/forums/22-...d-attempt.html

  10. #9
    Senior Member tepetit53's Avatar
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    Seems like the upload doesn't like to display pdfs. Here's a png. See if that works. Stille re-sizable without distortion.
    EE hlep needed-honda-cb400a-wiring-diagram.png
    Ted

    '79 CM400T
    '09 ZX14
    I don't text,
    I don't tweet,
    I don't friend
    and I don't 'like' anything

  11. #10
    Senior Member tepetit53's Avatar
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    Ugh. Still not as good as the pdf, though.
    Ted

    '79 CM400T
    '09 ZX14
    I don't text,
    I don't tweet,
    I don't friend
    and I don't 'like' anything

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