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If your original sticker/plate that would have contained the serial is gone then you can look on the powerhead itself for a "welsh plug".
First step is a compre.ssion test on engine. More info is needed!Type of boat.Weight of hull. What propeller is on engine,diameter& pitch. Possible
There is fine line between tweaking the shifter to hold it firmly into forward gear and binding the clutch cradle for premature failure. It is too easy
Is your engine running hot,what lights are coming on,oil,overheat,low water pressure, The engine is likely going into safe mode to reduce damage. Time
Sounds like original problem is still there,Seats in carb could have damage that cant be seen with the ***** eye. Just because he's certified doesn't