OX66 require regular maintenance and diagnostic test light. Fuel pumps can rebuilt. It is a thirsty motor. Sometimes it needs de carbon procedure.
If the boat us a good deal get a survey and a good shop to check the motor. If well maintained will last at long time but a thirsty motor. Inspect oil tank and mount which can rust. Oil tank might need a cleaning. Use ring free additive.
Inspect steering helm pump, hoses and ram for leaks.
Check throttle cables for smooth operation
New UFlex ones are great
Check age of batteries
Inspect switch panel
Invest in a moistures meter
Check all hardware - grab rails, cleats, etc
Expect some poor wiring, auto SAE wires and crimps, no fusing, out of date breakers , battery selector switches, under size wires, poorly installed items, bad running and anchor lights, check bow rail fasteners, check rub railing and fasteners,
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