....Yet another suspension question

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by KEELAYMONSTER, Feb 27, 2013.

  1. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    I have searched and cant seem to find any recomendations for fork springs for my weight and riding style. I am about 165lbs with gear, 5'7" on a '06 950A. I ride very aggressively on gnarly trails and single track. The only reason I slow down for whoops and big jumps is I am tired of hearing the front forks bottom out. I currently have the forks set to the sport setting + 2 turns preload and + 5 clicks comp (from sport setting).

    I planned on going with a thicker fork oil and a stiffer spring. I have stock springs right now.

    Any idea on spring rate??? :ear
    #1
  2. Qwik

    Qwik Adrenaline Addict

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    Talk to Trailtricks or super plush
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  3. FakeName

    FakeName Wile E Coyote SuperGenius

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    Trailtricks closed some time ago.
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  4. mousitsas

    mousitsas Long timer

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    Ι think thicker oil will screw up your fast compression dampening.
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  5. Hootowl

    Hootowl Long timer

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    Wouldn't the first thing to do is measure sag F&R?
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  6. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    .....I guess. Ill do that and report back.

    Good to know on the thicker oil. Thanks.
    #6
  7. Off Road Ryder

    Off Road Ryder Long timer

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    I had Konflict Motorsports revalve and spring my 950 after going over the bars last year.
    I cant tell you what a difference it made. Alex set my bike up really nice.
    If I remember right he used .65 springs
    I ride it like a dirt bike and could not be happier.
    #7
  8. Lurkerlou

    Lurkerlou Been here awhile

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    I'd like to put in a huge plug for Riders Edge Suspension here in BC.

    He knows suspension , he knows 9xx's and in one way shape or another he has either done or supplied the valving or springs for every bike in my garage.

    I just got to test out his handy work on my 990 a few weeks ago ( along with another buddy on his 990 who also had his done) and as always it was the best money spent.
    #8
  9. DuctTape

    DuctTape Been here awhile

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    When you start looking at suspension upgrades you really need to include not just your weight but also your weight in all your gear including any gear like loaded tank bags, etc.

    For example, I weigh 185 but after I put on all my gear and add my hydro pak and tank bag I'm now over 225 LBS.
    #9
  10. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    ... I did. I'm trying to get a good setting for aggressive off road. Not touring.

    At the very most I would say 175 with gear and what not. I'm a little dude man!!!
    #10
  11. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    ok. Race sag for front is 70mm. Thats with the preload at 9 turns.
    Rear sag is 44mm with 6 turns preload. I have stock springs front and back. The rear hops around on washboard stuff. The front bottoms pretty easily if a small jump has a flat landing. At some point Ill send my suspension out to SPS for treatment :evil For now I have budget constraints that limit me to just springs. Im just really tired of hearing CLUNK! :lol3
    #11
  12. Head2Wind

    Head2Wind MotorcycleMayhem

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    racetech.com has a decent spring calculator. I have used it several times to get me in the zone without a bunch of messing around with different springs.
    #12
  13. slackmeyer

    slackmeyer Don't mean sheeit. .

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    Be nice if we could get you to try out my bike sometime, I'm nearby. . . and a titch lighter than you, maybe 160 with gear.

    I had to change the rear spring, 130 seems much better. For the front, I went .56, I still run the preload all the way in- not necessarily a bad thing, but I think you could probably go .58 or .60 without any problem. I think valving on the fork makes a huge difference, too, but like you say, switching to something heavier (like synthetic ATF) would be a good start.
    #13
  14. crofrog

    crofrog Long timer

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    Not sure what springs to recommend for you, but also increase your fork oil level. I'm running 90mm of space right now and am considering going higher.
    #14
  15. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    Good to know. Thanks. We should ride sometime. I just moved to Pleasanton so I am even closer now.

    I just ordered .64's from KTM Twins. I figured I would rather too stiff to avoid bottoming out.

    Ill definitely be changing the fluid. ATF seems to be what a lot of people are using.

    Does a higher fork oil level increase bottoming resistance?

    Thanks everyone for all the replies. :clap
    #15
  16. Yardstick

    Yardstick Hydrophobic

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    I'm probably in the minority, but I think the rider is a less significant variable in determining spring rate with the 9X0's. You might be smaller than the average 9X0 rider, but the bike is still big and heavy. With less travel on the standard Adventure you have less cushion to absorb impacts too. You need that suspension to stay up in the stroke and the .64's will probably do well for you with less preload than your factory springs.

    You will get a lot of opinions on fork oil and fork oil vs. ATF. You can compare viscosities and other properties on the chart toward the bottom of this page.
    #16
  17. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    That was an interesting read. Im book marking that link for sure!

    Still debating on fork oil viscosity and whether or not to go with ATF. Im still thinking heavier than the stock weight though.
    #17
  18. crofrog

    crofrog Long timer

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    With cartridge forks the oil viscosity has less effect on high-speed compression/rebound versus low speed compression/rebound.

    So that's something to keep in mind that you can create a bit of an imbalance.
    #18
  19. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    OK. Got the .64's installed :clapReplaced the for oil with Maxima 5wt fork oil at 90mm level. I have 0 turns of preload, 15 turns rebound and 13 turns compression. Basically just put the dampning half way between the "standard" and "sport" setup. Unrelated I also pulled the steering stem apart, cleaned and re greased it while the forks were off.

    First impressions are good. A LOT less dive under hard braking. I have yet to do some hard core offroad with it but it definitely seems better.

    I'll keep everyone posted........now, to go find some sweet jumps to launch off of :evil
    #19
  20. KEELAYMONSTER

    KEELAYMONSTER BRRAAAAPPP!!!

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    These .64 are perfect. The only adjustments I've made are to reduce preload. My adjuster was already as far out as possible so I removed the spacer on top of the spring. That got it just right. I have riden some trails several times now and its an enormous difference. I no longer have to slow down for rain bars to avoid bottoming out :D I also commute 30 miles one way, every day. It hasnt lost any comfort however you do "feel" the road a bit more.

    This was probably one of the best things I've done to this beast
    #20