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Old 01-17-2014, 03:30 PM   #1
640Pilot OP
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Joined: Nov 2010
Location: Bayside, Brisbane. Australia
Oddometer: 97
04 950 Adventure fork oil weight / air gap set up ideas please

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
950 Adventure
FE 550 Husaberg
82' FXR Harley Davidson
So much little time...
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Old 01-17-2014, 03:40 PM   #2
Big bike friendly
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Location: Six feet from hell Phoenix AZ
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5wt oil....

Air gap 110mm....
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Old 01-17-2014, 08:57 PM   #3
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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.
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Old 01-17-2014, 10:55 PM   #4
Konflict Motorsports
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Location: Redmond, Wa-Thousand Oaks Ca.
Oddometer: 876
Originally Posted by KTMSER View Post
5wt oil....

Air gap 110mm....
+1, 105mm to 110mm. I would recommend staying away from 7.5 weight fluid without knowing how the bike has been valved previously.
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Old 01-18-2014, 12:14 AM   #5
orange spy
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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.

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