Re: 4-stroke 6 hp Tohatsu Outboard Issues
Bad gas, bad oil, I'm guessing this motor sat for a while. You should really do a thorough tune up. Engine oil and filter, lower gear case oil, fuel filter, air filter (probably just a washable element, spark plug, zincs (if more than half worn). You can try to run carb cleaner through the carburetor directly, such as Valvtec Marine Motor De-Carb. I'm not sure that adding to the fuel will do much, if she is already showing signs of trouble. You may need to re-build the carb altogether. You bought a low time engine, but sitting idle is worse than being used and having more hours.
By the way, were you getting a good tail of water flowing out from the cooling?
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.