1978 Honda CB750 SOHC F2 SS- Monoshock Conversion
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1978 Honda CB750 SOHC F2 SS- Monoshock Conversion

This is a discussion on 1978 Honda CB750 SOHC F2 SS- Monoshock Conversion within the Project Builds forums, part of the Caferacer.net Forums category; ??????????...

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  1. #1
    Junior Member Tayflyer's Avatar
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    ??????????
    Last edited by Tayflyer; 09-21-2015 at 01:18 AM.

  2. #2
    Senior Member Teazer's Avatar
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    Hornet (?) tank looks good but ideally the bottom surface needs to be flat or the back end could be dropped and side panels integrated somehow.

    Of the dozens of times I have been through/to Fife it always seemed to rain. Must just have been my bad timing I guess.

  3. #3
    Senior Member kerosene's Avatar
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    The problem with mono swaps is that the wheelbase tends to stretch in the swap. This looks ugly and makes the bike less nimble. How much longer is the new swing arm?
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  5. #4
    Senior Member hillsy's Avatar
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    What he said^^^

    You'll get another 2 inches in wheelbase at least. Might be a good thing, might be a bad thing depending on what you want the bike to do.

    Another option is to use the FZR swingarm as a twin shock. Just weld some shock mounts onto the top of the arm near the rear axle. Then (if you're keen / can weld alloy) you could cut out the monoshock section and shorten it to the same length as the CB arm. All depends on how far you want to go.....

  6. #5
    Senior Member kenessex's Avatar
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    The good news is that the FZR600 swingarm is not alloy, it is steel, so it is possible to just shorten it from the axle end to get the same wheelbase as original.
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  7. #6
    Junior Member CafeGav's Avatar
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    Quote Originally Posted by hillsy View Post
    What he said^^^

    You'll get another 2 inches in wheelbase at least. Might be a good thing, might be a bad thing depending on what you want the bike to do.

    Another option is to use the FZR swingarm as a twin shock. Just weld some shock mounts onto the top of the arm near the rear axle. Then (if you're keen / can weld alloy) you could cut out the monoshock section and shorten it to the same length as the CB arm. All depends on how far you want to go.....
    As Hillsy said this can be done, I done it on my alloy swinger and scored 2 inches, i did not go the twin shock route but rather horizontal shock mount, here is the link

    https://www.caferacer.net/forum/proje...s-retro-2.html

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  8. #7
    Senior Member Geeto67's Avatar
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    just from what I know about cb750 frames and not much else, You would want the upper shock mount to be right where the frame junctions under the fuel tank. Why? it's really strong there.
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  9. #8
    Junior Member Scotlandcaferacer's Avatar
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    CB project

    Found your project Tay, looks great.
    I'm from Falkirk area and run a Facebook page/group called Scotland Cafe Racer.
    Have a look and give the page a like, you can then post some photos of your project, the guys would like to see what your doing.
    Might even see you out on the road when it's finished. Got a good few guys from up your area on the page.
    Cheers

  10. #9
    Banned Witworth's Avatar
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    Quote Originally Posted by Geeto67 View Post
    just from what I know about cb750 frames and not much else, You would want the upper shock mount to be right where the frame junctions under the fuel tank. Why? it's really strong there.
    Like GT said. Also, the stresses at monoshock upper mounting points could be ten times the shock and force loads of a twin shock upper mounts. Leverage and multiplication factors with shock linkages, etc.

    In short you need strong tubes and brackets that feed the stresses directly to where GT said.

    Danger, is my business.

  11. #10
    Senior Member TrialsRider's Avatar
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    "Also, the stresses at monoshock upper mounting points could be ten times the shock and force loads of a twin shock upper mounts."

    :/ what did you do, park a car on it.

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