sorry i forgot about the headlights not working until the wheeler is on but it does sound like u have a low current draw so do the tests for the cables like i said before and report back
Hello what you do to fix it i have the same problemCarb and exhaust was pulsating at both ends. Instead of sucking at the carb and blowing at the exhaust. Spun the crank one full revolution and put the cams back in. Quad is cranking and running smoothly now. Only starts with a 100% charged battery. Charging system and headlights are still not functioning correctly... This will be looked into further tomorrow morning.