What was it?

Pinched vent hose?
Dirt in carb bowl?
Bad engagement spring?
Clutch buttons?
Clogged jets?

 

I responded to this earlier, but somehow it got erased. Anyways, the next day I rode the wheeler and it was fine. I feel kind of stupid, but I think the problem came from drowning the belt. Thanks everyone very much for your detailed help. I appreciate it.