Hi there, the other day I was out with my 2002 KX 125 2 stroke, I use a 32.1 mixture, I have never had a problem with this bike. I had stopped for a while for a hike and my dirt bike slipped on the tree and when I had returned all the fuel had leaked out the bike. I started it up after a few kicks with the remaining fuel and she fired up and road till nothing was left. after I re-fuled her up she started and road for about 4 minutes then turned off and would not fire back up. So I turned off the fuel valve and kicked out any remaining gas and let it sit for a week, when I went back and started it, the bike was shooting out smoke rings and making popping sounds. and would then die. what is wrong with it? Please help. ThankĀ“s