Thanks for that but I have to wait to be acepted on the forum,what I really need is information on what Yamaha had a second box behind the engine,this took the chain drive and converted it to a shaft drive.(it had it's own chain sprocket on the engine side and a shaft coupling on the output side, it made it easier for the manufacturer to give the bike a shaft for touring without having to tottally re-design the complete engine/box)I believe it was on the XS series possibly the 750 or 1100,this will make the job I am contemplating a whole lot easier as the bike is at the moment belt drive and I am looking to trike it in the future and use a car rear axle,I know a car diff can be converted to chain or belt but would prefer to keep things a bit simpler and find one of these change over units.
Stix