Could it be something as simple as the exhaust adapter at the lower didn't get the rubber rings? Or a loose torque tab? If the noise is in the lower you definitely need to drain the oil to see what you have. Does your motor have the trim rod that goes from side to side through the holes on the clamp? Could be a rattler. But that would go away when you tucked the motor all the way down. Could be the lever that holds the motor in the full up position. Throwing stuff out willy nilly..
Anyone with a travel lift or a forklift in your area? Maybe they can pluck it and you can have a look see on the cheap?
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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