I've been having trouble for almost a year now with getting my four wheeler to start. I just replaced the rings so I have compression. It is getting gas for sure becuase after craking for a short time the plug comes out wet (and the plug is firing). The mixture screw is set where my haynes maunal says it should be. Now when it does fire up (after a lot of craking) it runs strong, but after it is shut off it will not start back. What I do not get is that this all started after my dad ran it out of gas. I am out of ideas and need some help.