Hey, My buddy has a 91 kdx and it's been leaking quite a bit of gas. The gas hose below the bike will spit out gas everynow and then and especially if you rock the bike. Whats it sound like to you?
check the float needle and seat, most commonly shows up when the bike is (vibrating )at idle, -will not form a seal to stop fuel entering the float bowl. -will stop for a while when the throttle is cracked open. If it just leaks abit when the bike is lent over its nothing to worry about.
could be float height or worn float needle and seat
it should seal at idle!
did it just start?- could be a little dirty,or old fuel and oil gumming it up