I have a 2008 90 HP 4 stoke and just had it out for first time this year. We were tubing with 3 riders at a relatively high rev speed when suddenly the top end of the engine developed a loud knock. Almost a rattle sound. We slowly made it to shore. oil check upper engine and lower looked cleanOk. What would be the issue? The motor moved the boat but, the knock is continous
Last edited:
