One thing I thought I should add --

This is being sold by a Malibu dealership (certified Indmar service center) who says they "certify" all of their preowned boats, which includes the inspection/compression test. I have asked for a formal diagnosis of the knocking by one of their Indmar mechanics before I agree to buy. Not sure if knowing that it is an official Indmar service center changes anyone's thoughts on this.

I am speaking to the mechanic on Monday or Tuesday of next week, would love to hear some feedback before then.