Well put in and started seems ok, took off and seemed to have a hard time getting on plane....stopped on fished for a while took off again hard getting on plane just seems to struggle to get on plane. But while on plane seemed to run fine....took a long run then a low knocking sound was heard did seems too bad...no alarms (low oil/hot) then the knock got real loud then a small pop. sat down. The motor would start but sounded like the rod or something getting ready to knock out. The heads have been rebuild (I;m not the first owner) Now the great question!!!! Should I have it rebuilt???? or should I start looking for a new used motor? My fishing is done for the rest of the year......o well was having a good time...