I have two F125´s, one of which I have not used yet(both reg in 2003 but built much earlier). The one I use also has this rattle - now done 2000km -noise started about 1200km. The new one is totally quiet! A mystery at the moment and it is now increasingly hard to find anyone with the tech knowledge of these left to ask. i must admit it is a bit concerning, so come on someone whos knows, put us out of our misery!! Great scoot though.