Thanks for your reply Jeff,i dont know too much about availability of parts or the cost come to that.I did have a brief chat with Stan Stevens and he warned me about crankshaft problems and the cost of replacing it,although mine seems to be fine.The reason i pulled mine apart was the clutch wasn't working although when i pulled clutch cover off it seemed to work ok when i pulled the lever.but it didnt disengage the gearbox,so i pulled the clutch apart and there seemed to be plenty of meat still on the cork plates,is there anyway of measuring wear ?ill get new ones anyway for the rebuild.Also the powervalves on the top cylinder seem to have a lot of play in them unlike the bottom ones!!When i pulled left hand exhaust off it had petrol in it .Would this be something to do with the powervalves??
Any advice would be appreciated.Thanks.