04 950 Adventure fork oil weight / air gap set up ideas please

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by 640Pilot, Jan 17, 2014.

  1. 640Pilot

    640Pilot Been here awhile

    Joined:
    Nov 29, 2010
    Oddometer:
    110
    Location:
    Bayside, Brisbane. Australia
    Hi Guys,
    Going to a mate's to get my fork seal replaced this weekend, I spoke to a guy at the KTM shop and asked for confirmation on the best weight fork oil for the bike.

    I know my bike has S suspension upgrade and the forks have had other work but I can't confirm what...I'm guessing (until open it up) it's probably springs and potentially valves.

    Guy at the store suggested 7.5 weight oil. In my Berg and other Ktm owned used mainly 5 weight. A recent upgrade on my Berg saw a shift to7.5 weight, I had gold valve / shim set up installed and was already running heavier springs. I must admit I like the action on the berg and was concerned 7.5 weight would be to much but I was wrong.

    Main questions for your thoughts :

    a. Have any of you gone to 7.5 weight....if so...your thoughts

    b. With a move to a heavier weight oil would you suggest I keep the same air gap....reading the forum seems to suggest 100mm gap (using 5 weight oil)

    I haven't been able to find any assistance or info in the manual but will give it another read through this morning to see what I can uncover

    Appreciate any ides or points of interest

    Thanks in advance
    #1
  2. KTMSER

    KTMSER Big bike friendly

    Joined:
    Nov 7, 2006
    Oddometer:
    2,771
    Location:
    Six feet from hell Phoenix AZ
    5wt oil....

    Air gap 110mm....
    #2
  3. Zuber

    Zuber Zoob

    Joined:
    Sep 28, 2004
    Oddometer:
    2,614
    Location:
    Main Street, Shedd, Oregon
    The change from 5wt to 7.5wt will only or mostly effect the low speed damping. You can make the same change with new screw settings.

    Start with the std air gap. Add/remove oil to adjust spring rate in the last 1/3 of travel.
    #3
  4. Konflict Motorsports

    Konflict Motorsports KM TUNER

    Joined:
    Dec 30, 2009
    Oddometer:
    1,001
    Location:
    Redmond, Wa-Thousand Oaks Ca.
    +1, 105mm to 110mm. I would recommend staying away from 7.5 weight fluid without knowing how the bike has been valved previously.
    #4
  5. orange spy

    orange spy diddly squat

    Joined:
    Nov 15, 2010
    Oddometer:
    35
    Location:
    Athens - Greece
    you will not notice any serious difference between 5 and 7.5.

    also bare in mind that different brands apply different viscosities for one given label. 5t of wp is not the same necessarily with 5t of ohlins for example.
    http://www.peterverdone.com/wiki/index.php?title=Suspension_Fluid

    also, for any heavier oil keep the air gap constant, in order to evaluate properly. don't change 2 parameters at once.
    #5