hello lads,iev a 89 cr500 running in a 91 frame,iev a 91 engine in bits and went to change tthe clutch from the 91 to the 89 bottom and it wont fit,theres an extra steel plate and friction plate in the 91,is this right,also are there any other engine diffrences,ie porting,gearing,and whats the maximum oversize piston available, with much thanks. deano
