Our auto repair shop used to run into this on a regular basis (with cars). The buyer SHOULD beware... because the buyer WILL definitely have to pay in the end. Who would ever buy without an inspection and/or a water test (not for the cars)? Even our regular automotive customers, who really knew better, would do it based on some ridiculous criteria such as "it was cheap" or "it sounded o.k." or even "I knew the guy". OMG!
Almost ANY used boat or ski can literally end up being a total POS... even one for FREE! Don't waste your hard-earned money.