If it's the f650gs then I'm afraid there is no fix. You will have to buy new or get a second hand item. If you search online forums etc. You will see it's a fairly common fault.
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I have recently moved from an 08 KLR to a 2004 Dakar and while I really enjoyed the KLR I found the Dakar much more refined both on and off-road.
If you push a KLR off-road the suspension bottoms out and in the tight stuff being very top heavy gets tiring.
The Dakar has better suspension out...