I have a Sunray 50 cc that I bought for my grandchildren. When I bought it the electric start did not work. I replaced the battery and found a wire unhooked from the starter. I plugged the wire back in and the machined turned over but after a couple of turns I noticed the starter relay smoking, now I have nothing again. What could have caused the relay to burn out? I don't want to replace the relay if I am going to burn it out again.