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Hi Ron, my name is Jason.
All Mercurys are cataloged by serial number, can I get that number so I know exactly which engine you have?
Next, when was the last time it made full power under a load, what is the story behind the engine?
Have you done any diagnostic testing on your own yet, if yes, what have you done?
I would still need to know which engine you have. Mercury makes 2, 3 and 4 cylinder 50 horsepower engines. They also make 2 stroke and 4 stroke 50 HP's. Which one do you have?
Have you done any compression or spark output testing?
Phone service is available in the USA, are you in the US or another country?
Hello Ron, my name is***** will be taking over on your question if you still need assistance.