My Piaggio 50cc typhoon just gave up on me?

Coming into work in torrential rain it managed 5 miles then I felt it cut out then pick up again about 5 - 6 times. The headlight cut out but worked on full beam for about half a mile then it just cut out completely. When I try to start it it feels like it is trying but it doesn`t catch. I thought it might be a fouled sparkplug but tbh I can`t find where it is?