OK we got the carb rebuilt on the MF16. Now it won't start with out jumping it. So far we have checked the battery and it has 12.50 or so volts. We have looked at the wires and fixed a few that was chaffed or had bad ends on them. The headlights do come on with the switch key but when you turn the key to start it does nothing. Now if you hook up the jumper cables it will start. Where would I look for the problem at now? Any advice would be greatly appreciated.