Bought it a few weekend's ago and it's been rinnrun great. We were over at my buddies riding on some trails and we got back on the road to head back to his house. I was in 4th or 5th gear and it felt like it ran out of gas so I turned the reserve tank on and tried to get it back started and it didn't start. It's been a few days now. I've cleaned the carburator, checked the Reeds, looked at the Piston to see what shape it was in( in great shape) and put a new plug in that has spark but still can't get it to start. It is popped a few times but no start .Any ideas?