I got a FA50 from my brother a few days ago. I wass ridding it home an it kept cutting out. I know this is because of a bad spark plug, But the thing was it would kick right back over if i pulled over. But the last time i cut out when i pulled over the kick would not buge for nutin. It will move if i don't hold the left break but if I do then it don't kick AT ALL. Can somebody help me with this please?