The 50 and 125 are pretty much identical, the frame is nearly identical, its the motor that is different. I live in Norway, theft isn't really a problem here. But aprilia and pretty much most 50cc piaggio scooters are piss easy to hotwire. If someone wants your bike enough they will take it. The 50cc mojito sucks to work on as its all a bit tight, packed in, ive not really had much experience with the 125 ones, they have the leader engine if I recall?