My son took his CB360 out for a ride, mostly back roads, 45-55mph. Said bike started stumbling, thought he was running out of gas but as soon as it slowed down it picked up again. Stumbling got worse, noticed his headlight was flickering from reflection of car in front. He had no light when he pulled into the driveway. No headlight, tail, only the neutral indicator & no electric start. Battery was new according to the guy we bought it from a few weeks ago. He was a little puzzled when it wouldn't start but he kicked it & we didn't think much of it at the time. I put it on a charger as soon as we got it home & this is the first instance we've had any starting/running problems since that initial charge. I've got it on a charger at the moment. My guess is the charging system has something bad & that is why the battery was drained. Either the stator, regulator or rectifier is the problem but I would like to hear what the most likely culprit is. I don't have a multimeter & my eyes pretty much glaze over when people start talking about using them.