Join Date: Jul 2007
Location: Truckee, CA
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Re: yanmar ysm8 tick slap - video
No Experience with that engine, but some with others. I have noticed that when cold some sound similar, but with a single it is more noticeable. After getting to full operating temp, the metallic type noise seemed to mellow out. There is a whole lot of commotion going on in there when it fires. If it starts easily, runs alright, pushes the boat, doesn't heat up or smoke excessively, use excessive amounts of oil, and the coolant is not milky, it is probably/possibly good for a while. A good long hard run should show any severe problems. An oil analysis may show severe wearing or excess fuel problems.