What I would be doing is removing the carbs and reeds and completely cleaning them out because chances are they're full of gunk. Do this and then get yourself an aftermarket air filter kit, one that has an aluminum adaptor. Then put it back together and go from there. Maybe, just maybe engine damage is not too severe and you might get away with it. Is that how you got it with the air filter like that? The dude you bought it off has just put a zip tie around the foam to hold it on >FAIL!<