Yeah dude those 39mm Fcr carbs need to be real clean so I would pull it off and check everything out and make sure your cable is connected right because it sounds like the flat slide is smacking the top of the carb
Ok start the warrior and pull the crankcase vent tube off of the airbox. If there is smoke coming out you have blowby. If you have blowby it is time for a topend overhaul