Pete, (scooters not really my thing) if you have a good spark, proved by removing plug from engine and in HT lead holding against engine and using electric start to turn engine over to give a good bright spark at plug. if you have a good spark as its stood for a while I would suspect the carb. petrol goes off if left in carbs for long periods. this blocks the very fine holes in the carb and jets. these have to be carefully cleaned out. you can get engine start type sprays (Halfords etc) to spray into airbox then turn engine over. if she fires up its your carb.
xs11
April 2015