;)I wouldn't use fully synthetic oil in a bike engine with a wet clutch. It will and does eventually cause clutch slip, unless you are running an exotic friction plate material. Only bikes like Ducati's with dry clutches have fully synthetic oil specified. You will find that the 'Yamaha oil'...
I noticed the passenger seat unit on the faired bike is more comfy than the naked version. Can you inter-change these? Are the sub frames the same? Can you change the whole seat unit (so as to get the grab handles) ? Any help would be appreciated.