I just got a bore job done on this thing but I don't know if this is a problem or not... I started it up for the first time the other day and it started right away with no problems at all... then I turned it off and and then I started it up afew min later and she back fired. so I tryed to start it again and she fired right up with no problems. and then the same thing happened today... she back fired... but she starts and rides fine... but I noticed gas on the air filter could that be my problem is she floods? and where do all 3 vent hoses go thats on the carb?

 

sounds like maybe the float isn't set correct allowing more gas to flow and then you start it firng the excess gas causing the back fire.