Fork spring direction?
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Thread: Fork spring direction?

  1. #1
    Senior Member Chippe's Avatar
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    Fork spring direction?

    Honda CM400 1979-1980

    One side has tighter coils.
    Tight end up or down?

    I think the illustration is a certain year of a CB400T but there are no others in the manual.

    The manual shows tapered side down. My fork spring is more straight and doesn't look tapered like in the picture but I've seen that type of spring on internet. However If I look closely the last coil is actually a little bit smaller so I guess it should be down. That means tight side up.
    My springs was put in the other way with the tight side down and that's how most people on other Hondas has their spring from what I've seen but it doesn't mean it's correct for my model.

    Edit: the tight side should be up according to Haynes manual and they had a non tapered spring just like mine.

    Fork spring direction?-spring.jpg
    Last edited by Chippe; 06-26-2019 at 05:12 PM.
    Honda CM400 1979

  2. #2
    Senior Member TOOLS1's Avatar
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    I install them with the tighter wound coils up. This reduces unsprung weight and allows more room at the bottom for the fork oil.
    TOOLS
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  3. #3
    Senior Member Chippe's Avatar
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    Thanks Tools!

    Hmm, isn't the tight side heavier?
    I already put them like you suggest but it's also easy to flip them if needed.
    Last edited by Chippe; 06-14-2019 at 01:55 AM.
    Honda CM400 1979

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  5. #4
    Senior Member TOOLS1's Avatar
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    Yes, the tight side is heavier. At some point along its length, the weight of the spring changes from unsprung at the bottom to sprung at the top.
    TOOLS

  6. #5
    Senior Member Chippe's Avatar
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    Thanks for explaining. I had to look up unsprung to understand why lighter unsprung is benificial
    Honda CM400 1979

  7. #6
    Senior Member Chippe's Avatar
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    Quote Originally Posted by TOOLS1 View Post
    Yes, the tight side is heavier. At some point along its length, the weight of the spring changes from unsprung at the bottom to sprung at the top.
    TOOLS
    You were right. I got a photo from Haynes manual where the tight side is up like you suggested.

    Fork spring direction?-0.jpg
    Last edited by Chippe; 07-09-2019 at 01:46 AM.
    Honda CM400 1979

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