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Lowering forks. BMW K75S cafe build.

This is a discussion on Lowering forks. BMW K75S cafe build. within the Project Builds forums, part of the Caferacer.net Forums category; they're damper rod forks, they don't do low speed compression. you can put emulators in them, or even adapt some cartridges in. the sports valves ...

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Thread: Lowering forks. BMW K75S cafe build.

  1. #11
    Senior Member brad black's Avatar
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    they're damper rod forks, they don't do low speed compression.

    you can put emulators in them, or even adapt some cartridges in. the sports valves have both rebound and comp adj, but the prices scares a lot of the not so serious off.

    7" of travel is nuts. well sprung 4" should be fine.

  2. #12
    Junior Member Panchoplanet's Avatar
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    Found this @ Dennis kirk site, a simple weekend upgrade that should improve ridability.
    https://www.denniskirk.com/progressi....prd/58967.sku

    Pp.

  3. #13
    Junior Member Panchoplanet's Avatar
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    Found leaky tube while rearranging clippons and headlight and removing accordion tubes.
    Ordering seals and springs and some other assorted parts, in the meantime will tackle exhaust and electrical.

    If anyone has any resources for simplifying wiring please let me know.

    TIA.
    Pp.
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  5. #14
    Senior Member brad black's Avatar
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    Quote Originally Posted by Panchoplanet View Post
    Found this @ Dennis kirk site, a simple weekend upgrade that should improve ridability.
    https://www.denniskirk.com/progressi....prd/58967.sku

    Pp.
    they're more accurately a dual rate spring. to be truly progressive the gap between the various coils has to increase incrementally. the rate they give is 0.63 - 0.89 kg/mm, which is too soft to on the soft side. that's what the std "too soft" ducati monster and ss forks springs are, and the k75 will be heavier on the front.

    the main issue i have with "progressive" springs is that they generally start off being too soft and giving a heap of sag (unless you preload the shit out of them), then they get too hard at the end. especially if the oil height is a bad spec and gives a lot of air spring effect.

  6. #15
    Junior Member Panchoplanet's Avatar
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    Thanks Brad Black for the insight, now I know why so many go for Honda and Yamaha forks in order to improve on this design.
    In the meantime replacement forks aren't on the menu or budget so will have to do my best with what I have.

    One other thing I noticed is that there is no dust shield on the lower legs after removing gaiters ,was hoping to get rid of them, don't like that BMX look they give.

    Any input will be greatly appreciated.

    Pp.

  7. #16
    Senior Member kenessex's Avatar
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    Go back and re-read Brad Black's posts. Shorten the travel an inch or 2, fit the progressive springs and use slightly heavier fork oil set to the correct level. Put in emulators if you want to spend the money.
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  8. #17
    Senior Member brad black's Avatar
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    you can probably just cut the std springs. i do that quite a bit.

  9. #18
    Senior Member Farmer_John's Avatar
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    Quote Originally Posted by brad black View Post
    you can probably just cut the std springs. i do that quite a bit.
    Which increases spring rate...

  10. #19
    Senior Member brad black's Avatar
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    Quote Originally Posted by Farmer_John View Post
    Which increases spring rate...
    that's the point.

  11. #20
    Junior Member Panchoplanet's Avatar
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    Quote Originally Posted by brad black View Post
    Quote Originally Posted by Farmer_John View Post
    Which increases spring rate...
    that's the point.
    What about cutting down the new progressive springs, say a 1/2 inch.
    That may be what I'm looking for, just have to figure out what dust seals to order so I can delete the accordion gaiters.

    Pp.

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