This is a stock (except for spark plug) 60cc flyinghorse engine. It's run perfectly for over a year as a daily driver to school and work. I was idling at a stop light today after filling the tank up and it cut out. Just like if i had hit the kill switch. She wont start at all just turns over and turns over and as soon as i stop pedaling stops turning. It's too dark to do anything tonight so I'd like some suggestions o what could be wrong for the morning. Anything will help, thanks!