Hit there, i have a modified Aerox, it starts and rides but after a while loses power, it will usually reach about 60mph but can die down to about 10mph (which can be dangerous) this was after just 3miles of riding, anf then also i was on my way home and its died asif i turned off the ignition, i have no idea what the problem could be, i was thinking maybe a sparking problem?? I desperately need advise as this has really baffalled me :S

sounds like your coil could be breaking down under load.

ride you scooter at 30 mph for a while,,

iff it rides without dying this could confirme the coil theory.