Fork midvalve question- and other DIY suspension tuning

Discussion in 'Dakar champion (950/990)' started by slackmeyer, Sep 5, 2011.

  1. Torque

    Torque Been here awhile

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    Long travel bikes have softer rear spring
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  2. Whodatschrome

    Whodatschrome Long timer

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    Since i've posted up a few questions in this thread myself a few pages back, i'll give you all a short results update on what i did. I just got my suspension from George at Suspension 101, and it's crazy awesome now. Yes it was expensive, but so well worth it. So whatever advice that @Torque is giving out here, from my experience with his work, it's probably spot on. The only, and absolutely only thing that i think he needs to change, is to have his fork stickers made in an orange color.
    Bonnie & Clyde likes this.
  3. ThirdUncle

    ThirdUncle More will than skill Supporter

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    Mid-summer, I replaced the OEM shock with a 990ADV unit on my 950SE, after having Rob at Lang's Off-Road install the taller spring, redo the guts, etc.

    Took it out on the Oak Ridges-Ganaraska Trails and in two minutes was laughing out loud at the bonkers difference. I could sit down! In the rough! And without rendering my spinal cord into splinters. I could roar up and down nasty boulder strewn hills at full speed like those boulders were party balloons. I also stopped airing down, running street pressures in my Tractionators. And that was pure Grrrrrr.

    Chappies, I could go faster over and through everything wet, dry, hard, soft, sandy, muddy, twisty, turny. My confidence levels smashed through the glass ceiling, or whatever that thing up there is. There wasn't one hooligan move that wasn't made 40-50% easier on the filthy beast. Even street hazards got tamed, seeing how many of Toronto's roads are more busted up than Ontario's trails.

    Except... now it's so effin tall -- guessing two inches more now -- that I tipped over a few times in trails at low speeds because there was no there there when I put a foot down. I dialed the screw down as low as I could and backed off a turn or two, but that made no meaningful diff. I've got a 32" inseam, which doesn't help. I've ordered a new one, but they're backlogged. I also just switched to new Sidi boots which are substantially lower than my old cheap but bomb- (but not water-) proof Alpinestar Tech 3s, with their amazing short man remediation treads.

    Anyone who's done this mod encountered / solved this extra question thing to their satisfaction?

    Can't really tell by looking, but here's a gratuitous porno pic with aphrodisiac to set the mood...

    IMG_9615.jpg
    MadM and Whodatschrome like this.
  4. Whodatschrome

    Whodatschrome Long timer

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    On my 950A I removed my seat cover, dished out some of the foam, then stapled the cover back on. It definitely changes the seat to footpeg distance, but at least i can get the tip toes of both my feet down now.
  5. Torque

    Torque Been here awhile

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    Did you match the additional travel in the rear by extending the travel in the forks?
  6. ThirdUncle

    ThirdUncle More will than skill Supporter

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    How's your ass been holding up?
  7. ThirdUncle

    ThirdUncle More will than skill Supporter

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    No. Haven't touched the forks.
  8. Torque

    Torque Been here awhile

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    Either shorten the shock or lengthen the forks. Surprised your not getting head shake. Can shorten the shock some but have secondary bottoming system that you have to be aware of. Do not want to go into that system too early.
    bananu7 and dooby like this.
  9. ThirdUncle

    ThirdUncle More will than skill Supporter

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    Lengthening the forks? To make the bike even higher?
  10. Whodatschrome

    Whodatschrome Long timer

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    I stand 95% of the time. I very rarely sit. It's definitely a trade off, but i'm in good enough shape that it hasn't been an issue for me (yet).
  11. 1coolbanana

    1coolbanana Long timer

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    Youre steering angle will be much sharper with the ass so high and unmatched on the front.
    Take care you dont end up in a tank slapper.
    You really need to shorten the shock or lengthen the forks to match.
    bananu7 likes this.
  12. Boianovich

    Boianovich Old and Cautious

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    Did you set the sag at the OEM height or???
  13. ThirdUncle

    ThirdUncle More will than skill Supporter

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    This is where I need to bring in @keener who helped me with the upgrade.
  14. keener

    keener Speed changes you.

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    OEM Height for now, we will adjust it to his weight at some point.
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  15. MadM

    MadM Dreamer Supporter

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    On Thursday I am finally (2y in the making :hide :fpalm ) dropping my rear shock at a shop for a well overdue service. While the shock is there, I will supply them with a 140/265 spring and washer for lengthening to "S" spec and installation of the custom shim stack.

    Shim stack that will go in is the following:
    shock shim stack.JPG

    I hope @Torque and anyone knowledgeable can make a comment on this?

    Thanks!
    1coolbanana and bobone like this.
  16. Torque

    Torque Been here awhile

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    Happy to help but need to know the bike, the year, the travel, your weight, how fast you go, terrain. or just your intent. Do you have a racing background? Bags, passenger, your height. Do you stand or sit, etc. One size does not fit all, not even close.
  17. Torque

    Torque Been here awhile

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    Spring rates?
  18. MadM

    MadM Dreamer Supporter

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    I knew I forgot to add some more info :hide

    04 950 Adventure standard model - going for "S" spec with 265mm travel all-round
    My weight is around 70kg no gear (155lbs)
    I ride enduro/extreme enduro/some MX with my 300 2t and did Albania Rally last year on a 450, I can be fast, but I am no pro.
    Terrain (Central Europe, from Alps to sea side) mostly gravel roads with some off-road and tarmac work. I prefer better good off-road manners than road.
    Bags will be on the bike at some point for a trip once or twice a year (Enduristan Monsoon size). No racks, engine bars or similar stuff, bike is on a strict diet.
    100% alone on the bike
    Off-road I stand 95% of the time
    Spring rates will be 140 rear and 0.56 front (valving in the picture below).
    [​IMG]
    * 36 ring shim is replaced with 36x0,2 standard shim (this is an old picture)

    Thanks!
  19. Torque

    Torque Been here awhile

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    Shock I think you are in the ballpark to get some testing done and may need some fine tuning.
    The rebound I think is a bit light. I would add a face shim or two.
    I would also maybe stiffen up the compression valve a bit. Your pretty aggressive and I think you might be cranking in the high speed to keep the shock from going too deep.
    Regarding the forks I simply do not know how to valve a standard design. I only do sprung mid for many years and completely different base design.
  20. Whodatschrome

    Whodatschrome Long timer

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    MadM, you and I are both the same weight, both have 265 suspension, both bikes have a similar diet, both are bikes see little pavement, we ride the same enduro bikes, and we probably have a similar riding style too. I wish you could test ride my ‘06 950 that Torque recently worked on. He set it up for aggressive desert riding.