At some point, everyone has a problem with their lawn mower. It seems to be running rough or quits running half way through cutting your lawn and you have to keep starting it and you get frustrated. It may be something as easy as the spark plug. Before taking the lawn mower in to have it repaired try to do it yourself with this easy tune up. Change the spark plug, air filter, oil, and blade and your lawn mower should be tuned up and ready to go.