You should listen to me. No, seriously, listen to me.
Join Date: Oct 2008
Location: Santa Barbara
Motorcycle: Blue 2006 GSX-R1000
Re: K9 1000 stock steering damper oil weight??
I don't claim to know but no one else has responded so here goes. I'd bet that the same, or nearly the same, oil is used as in the non-variable dampers. The damper fluid appears to be accessible via either the solenoid or the plugs at either end of the secondary passage, suggest that you try the solenoid first and only remove the plugs if you can't otherwise get the air out after changing the fluid. Try 10 wt first and only go to heavier fluid if you need more damping. You'll only need a couple ounces. Don't know if it's available in SA but one of the best is Red Line Medium Red, because of its very high viscosity index. There will doubtless be a bunch of fooling around to get the air out. You'll just have to keep working at it. Your dealer is ducking the issue because there's no official procedure on it.
You may have to use their 5 wt if the 10 wt proves to be too stiff.
Another thing that can be done is to modify the damping vs speed relationship via a flash.