Thanks for that Grumpy, i have begun the job, and i will post the deatisl & photos in a new thread, so far to sum up, i have de-carbed the head, valves, seats & piston, cleaned over the engine, flushed the tanks, and done a complete peice by peice rebulid of the carburettor.
I need to wait on a new head gasket, lower oil seal, and crank case gasket, in the meantime i will be doing the carburettor for the 93508.