Dave has a dohc, I don't remember what year but it is 79-82 and clutch should be the same through all those years.
Dave, was this a subtle thing or a sudden issue? Generally when this happens, it means the clutch plates are worn out and do not slip right.
Have you noticed any different in clutch feel or pull? If the pull is different, a spring might be shot or broke.
The ride IS the adventure. The destination is just to get gas!