Airbox wet inside

just read wobbly_trails guide to airboxes.
when i last opened the airbox to replace the air filter, there was liquid (i gathered it was petrol from the smell). it never used to do this so im just wandering if anyone knows why it use doing this and possibly how to fix it?
cheers

 

your reeds might be worn causing a blowing effect through the carb and into you airvox

 

nice one, was thinking of buying reeds when i last bought parts but my budget didnt allow it, will get some next time i get money and an order in

 

as said reeds getting knackered

but it is normal up to a certain extent

 

also if your running rich/over fueling causes like a petrol mist and it collects

 

thanks for the replies I try to run 20ml to 1L, 50:1?? also, been suspecting overfueling for a while as i get 90 miles out of 8L of fuel!!! main jet size has been changed from 53 to 58, but it shouldnt of made that much difference to fuel consuption imo