I have a pocket bike that I replaced the engine on to a 110cc engine,but I can't find the right spark plug engine #(KN152FMH-2) so before I changed engines the rectifier was setup as ( top left pin-yellow wire/ bottom left pin-RED wire/ top and bottom pin right side were wired together to ground,is there a reason for it to wired like that.I thought it was wired top left RED,bottom left WHITE,top right YELLOW,bottom right GREEN. Then today my rectifier started smoking.also what size battery for a pocket bike.