I just sent my son home with his first KZ...nice bike, just cleaned the carbs, gave it a tune and it is running beautiful. Trouble is, he's 200 miles away and telling me the bike has begun leaking gas out a tube that falls directly in front of the rear wheel. My first thought was the carb overflow tubes but he says it's not those. He said it seemed to be coming out of a drain line from the bottom of the air filter box. After taking the filter out, he found a small pool of gas in there. Can anybody tell me why gas would be backing into the air filter box? Is there another line that might be bringing gas in to the filter? Thanks for any help.