gt80 problem

[Joeschmo]

i have a problem with the clutch and dont know where to start. the clutch slips really badly whenever i let it out of gear i was playing around with the screw that pushes on the clutch rod to see if that was the problem. but it wasnt so is it the clutch plates im not sure ?

 

[Patman]

Sounds like clutch plates, could be weak springs too. When was it last serviced? Does the oil look very contaminated?