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yamaha f25 bogging down

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  • yamaha f25 bogging down

    I have a 25hp yamaha that boggs down when giving it throttle to speed up. I can hold my hand over the funnel air intake, and it will run great. Anyone know why this is? How so I solve the problem?

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    air to fuel ratio is off, need to clean the carbs again.
    make sure the tank is cleaned and flush out lines and pump