Front forks top-out (???? opposite of bottom-out)

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Rokie

Race Dog
Joined
Oct 31, 2008
Messages
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Location
West Coast
Bike
BMW F650GS / Dakar
Hi,
My front forks seem to have a knock at the top of its travelling range - i.e. when it is fully extended, e.g. when there's a dip in the road (as opposed to a bump) and the forks extend to their fullest. it also happens when I go over significant corrugations. It feels like the knock comes at the top / fully extended position of the forks.

Do I need new fork oil? Last changed 5 years and 20 000km ago (yes I only get to do 3000 - 4000km per year  :( )
 
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