I have a ticking noise coming from my engine on a 2000 Launch DD - there are no noticeable issues and the boat runs great with no issues. The noise started last fall after I tightened the front belt. It is a mild ticking noise which matches the speed of the engine (higher rpms the faster the sound repeats). I thought it was a bad alternator bearing as the alternator shaft was a little loose, so I had the alternator rebuilt, but the noise is still there. I have tried placing a stethoscope on the parts around the area, but i cannot pinpoint where it is coming from. Anyone have a suggestion on how to locate the problem?