I let my friend ride my electric bike and he's bigger than me, he rode it for a minute and then it didn't work, the batterie hada full charge and turned on but the twist throttle when i turned it, it didn't activate the wheel.. the wires are all connected everything looks fine.. what could be the problem.. is the throttle broke~is there something wrong with the control box, my electric setup is three weeks old, does anyone know what to do????