clutch slip at higher revs

hi on my recently aqiured 2001 m750 framed monster with a 900 engine(96) ive recently serviced it. now on the way home done the m2 when ever i pulled the throttle back at 5000plus revs the clutch slipped in the last few gears but when i came of motorway in lower gears i couldnt do it again when i gave it a hand full.can i adjust the clutch or is it not that.??????????????????????