Good evening, we have bought a second hand bike which is a import ( all wrote in Chinese) you can hold it back on full throttle so something not right. It had the lights on top of the headlight but the right hand light doesn't light up, I know it works as it flickers when it's turned on and off. You can set off up a slight incline but it just shows down on throttle. You can pedal it on assist but it shouldgo up. Is there any checks we can do? Thanks for your help. Also new battery's put on had slightly helped but not much. 
