Kawa 100 sports g7 clutch issue

Hi guys
Picked up a 74 kawa 100 sports g7 the other week, was in a few pieces at the time but have it back together and running
Am having issues with the clutch, replaced the orig oil with a car oil that was in the shed, i think it turned out to include a friction modifyer, changed that for a shell bike specific oil once but am having issue with the clutch slipping still, also the clutch is failing to disengage some times when i pull the lever in, tonight i have changed the oil again thinking that it might help and haven't had a chance to retest yet, when the clutch fails to disengage when i pull the ever in it either stalls going from neutral to 1st or changes gear like i'm not using the clutch at all between gears
If it was only slipping or only grabbing i could understand but doing both is confusing?
Sorry for the long post but wanted to try to give the whole picture
Cheers
Matt
Picked up a 74 kawa 100 sports g7 the other week, was in a few pieces at the time but have it back together and running
Am having issues with the clutch, replaced the orig oil with a car oil that was in the shed, i think it turned out to include a friction modifyer, changed that for a shell bike specific oil once but am having issue with the clutch slipping still, also the clutch is failing to disengage some times when i pull the lever in, tonight i have changed the oil again thinking that it might help and haven't had a chance to retest yet, when the clutch fails to disengage when i pull the ever in it either stalls going from neutral to 1st or changes gear like i'm not using the clutch at all between gears
If it was only slipping or only grabbing i could understand but doing both is confusing?
Sorry for the long post but wanted to try to give the whole picture
Cheers
Matt