sorry if this is a jetting thing. but I couldnt find my answer in the jetting post. so my kids bike eats plugs.1 per ride. the jetting is lean as per spec.(still smokes and black plug) I thought the crank seal was leaking(changed it out. and someone on here said your float could be out. then we noticed if you lean the bike at all .it would start to leak gas from the overflow tube. the bike starts like a champ. runs good as long as it has a clean plug in it.i just don't understand how the float can make it rich? can someone tell me how this can make the bike rich?