Hi from a fellow Stornello owner. 100% it’s a scam.
I assume as 71 and 73 reg that these are both the later 5 speed bikes.
Do you have any engine spares? There is a guy on the forum that is in need of a crank for a 5 speed engine.
I also know a guy that is after a headlight for a 5 speed if you have one. I’m trying to think if I’m after anything myself as I have a 4 speed Turismo and a 5 speed scrambler.