Your carb is supposed to suck the oil backin only thing it comes out faster than the carb and suck. the air cleaner filter get saturated with oil and drips on your bike,, sucks to have to keep cleaning off. Trust me had it happen to my 02.. I bored out oil tubes, tapped it put in longer tubes with a small piece of rubber hose and directed right into carb, still drips a lil and only when i do a hard ride constant 80 90 mph. cost to have a dealer do it would be around $250 or if you can do it yourself $30.
Babella