Toward the end of season I noticed a rattle when engine was at idle and it would quite down when throttling up, the last couple of times out the rattle was very noticeable, so now that the boat is put up for winter I took valve cover off too see if the timing chain had any slack in it, the right side seems to have some slack in it, so I've pulled the power head to get to the timing chain I'm currently letting it drip overnight but I went ahead and cleaned the oil sump and found these pieces around the pump any idea what they are, I put dip stick in for size reference ,next chance I get I'm going to take cover off bottom of power head to look at timing chain components hopefully I will find the culprit there.
If there were a bunch of teeth in a row munched up might be different but you have only got the odd tooth with a nick in it . Run the chain around the sprocket after your repair just to make sure the chain sits well on the teeth . Honestly Id be more worried about why the tensioner failed in the 1st place .