Engine over revs clucth engaging?

Guys,
My engine seems to over rev while going down the road at hi way speeds. It seems to me that the clutch may be engaging slightly while driving even with my foot off the clutch because I notice a change in my RPM's?

How do I adjust the clutch this is a A833 it is brand new and has less than a 1,000 miles on it.

Any help would be greatly appreciated.
Matt