I recently bought another ST162 (off XR Pilot), and the engine light has been on ever since. I was looking at the engine today, when i seen the screws on the rocker cover were very loose, so i tightened the front ones, and turned the engine on, and the engine light was no longer on. I then tightened the rest of them, and made sure they were all tight, and when i turned it back on, the engine light was also back on. Has anyone ever seen anything like this before? And what are some usual causes which make the engine light constently stay on? It not being driven for 6 weeks prior probably has something to do with it, perhaps something has seized?