What is the reason for the slow speed increase of Lifan 150 engine of Horizon motorcycle?

Let's see if the engine of the vehicle is working normally. Engine oil circuit or sensor is working abnormally. The vehicle will be very fragile. Accelerate slowly. I suggest driving to the repair shop.

Check the ignition system, especially the ignition and spark plug, and clean the lower throttle. It is also possible that the gear shift is too early and the engine torque is insufficient. Only by stepping on the accelerator can high-speed gear shifting accelerate quickly.

It is recommended to clean the throttle and idle motor, and it is best to replace the gasoline filter. If the vehicle is not used for a long time, the gasoline in the fuel tank will deteriorate, produce colloidal substances, block the normal oil circuit of the engine, and even block the injector in serious cases. Therefore, it is necessary to do a cleaning.