Thanks Dog33!
I shut off my fuel valve as well, so I think it might just be fuel kicking back into the airbox from the carbs on decel... but I'm not sure. Anyway, I've cleaned the air filter and will change the oil tomorrow. Also, plan to swing by the shop/dealer and see if theyhave any ideas how to prevent this in the future. Maybe lean it out a little.
Thanks again!

-CT