I have a strange problem. my atv wont idle unless i have my battery charger on it. The battery is reading 12.9 volts and with the machine running it is reading 14.9 volts. I can keep it running by holding the throttle but as soon as i let go it dies. When i leave the charger on it , it idles like it should but as soon as i pull the clamps off it dies. Lights all work properly and when driving it acts normal. I thought this atv should run without a battery because it has both a recoil and electric start. Any ideas ??