Websep 15, 2010 · when your lawn mower engine turns over easily, but won't start, you will have to troubleshoot the cause of the problem. Small engines rely on three key. Webfeb 7, 2024 · 1. Inspect the spark plug. Web5 days ago · if your mower won’t start, the first place to look is the fuel system. If your lawn mower has been sitting for a while, the fuel may have gone.