i have a clutch problem on my old gsxr 1987... The clutch is slipping from 2. gear and up. I have reasondly changed the plates, and springs, and the bige ran fine for about 1000 km. but now it slips again... i use 10w50 elf motorcykle anticlutchslipping fullsynth oil... should i change the oil to a half synth or is it something else? anyone tried this before???