It sounds like you have some air in your line--or someone put a Surflex slipper clutch in the bike when you were not looking....
I had the same problem on my 95 916. The fluid would get very dark and the clutch pull was very light (sometimes). When I flushed the system the clutch pull would firm up--until it got dark again. When I swapped the slave cylinder for a large bore billet slave-it eliminated the dark fluid and the inconsistent clutch pressure.
I had the same problem on my 95 916. The fluid would get very dark and the clutch pull was very light (sometimes). When I flushed the system the clutch pull would firm up--until it got dark again. When I swapped the slave cylinder for a large bore billet slave-it eliminated the dark fluid and the inconsistent clutch pressure.