Cosa cluch on PX 200

Hi all

I have serious problems in my efford to try to fit in a Cosa cluch on my PX200 - it keeps on 'opening' - i've tryed with the SIP recomended thin washer insted of th original, i've tryed tochange the cluch with a nother - but same thing happens... after 100m and one or two gear shifts, the cluch opens!!! Any help from you guy's?






did you changed the mounting nut on this one too?


and use only sae30 gear oil!











Hi - sorry for the 8 years respons time :-) I will order the mutter, but whar about the mutter-locking mechaism? - do i need anything else? washer or similar?