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  1. #1
    Super Moderator Znabb's Avatar
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    CM400 newbie charging system question

    I have no experience at all of the CM/CB 400. Is the charging system of the more modern and stronger 3 phase type on these bikes like on the CB550 four? Would it be possible to ad electric acecssories like handlebar warmers?

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  3. #2
    Sensei 66Sprint's Avatar
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    Stephen Lohmeyer,3839 Sun Valley Lane, Roanoke, Virginia 24014 540-525-5199Sixtysixsprint@aol.com
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    Re: CM400 newbie charging system question

    Ronnie it's not that much better than the 450 has...just more modern components....The Battery amperage is the limiting value to my thinking....

  4. #3
    MnBikeGuy's Avatar
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    Re: CM400 newbie charging system question

    Ronnie
    According to the HSM, the alternator puts out .17kw @ 5,000 RPM. Not a whole lot of overhead to run anything else.
    Mike

    It's always a good day to ride


    1980 CB750F
    1981 CM400 "T" - SOLD
    Sadly I'm Twinless for the time being...but I'm looking!

    http://i981.photobucket.com/albums/a...h_IMG_9965.jpg

    Link to the official 1978-1981 CB/CM400 Honda Service Manual

  5. #4
    Super Moderator J-T's Avatar
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    Re: CM400 newbie charging system question

    Both HSM and Clymer say that at 5000rpm you should be supplying a 5 amp charge to the battery with the headlight on high beam.

    If you can find handwarmers that will use 5 amps or less and you can keep the revs up around 5k most of the time :P your battery won't go dead right away

    It sounds like there may be some extra juice to play with on the highway but we're using most of whats there already driving around town.

    I'd be interested in what you get for results if you decide to give it a try.
    JT
    81 CM400T Under re-construction
    82 GL500

  6. #5
    Sensei 66Sprint's Avatar
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    Stephen Lohmeyer,3839 Sun Valley Lane, Roanoke, Virginia 24014 540-525-5199Sixtysixsprint@aol.com
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    Re: CM400 newbie charging system question

    Ok...Let's assume the entire 5 amp charging current is available...Since W = A x V, and we have 12V, that gives a maximum of 60W available... Minus flow/resistance losses, let's call it 55W to be safe.......But you'll have to keep it at 5000 RPM or above to maintain or exceed that... (just keep the net charging at zero)... Since electrical generation is a logarithmic factor of the rotor speed, the 1100 RPM idle would only produce about 38% of that....... You are looking for a 21W max accessory......which is about a taillight bulb in heating ability.......

  7. #6
    Super Moderator J-T's Avatar
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    Re: CM400 newbie charging system question

    I think he said it won't work.
    JT
    81 CM400T Under re-construction
    82 GL500

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