What is the reason why Wuyang Honda EFI scooter will stall?

There are many reasons for the flameout of the EFI scooter, such as serious blockage of air filter, exhaust pipe, oil pipe and gasoline filter, failure of ignition system or damage of spark plug, unclean throttle, failure of fuel injection from EFI nozzle or damage of control system and sensor, poor line contact, failure of electric door lock, insufficient compression of engine (such as air leakage of valve or serious wear of cylinder piston) and so on.