2011 Mercury 4 stroke 9.9hp

by Al
(Crossville, TN)

Engine starts with no problem. In neutral I can rev the engine wide open. Only did it to make sure it would. I put it in gear and the engine runs smooth. But.. When I open the throttle the throttle opens completely but I only get about 1/2 throttle as far as engine rpms. Not enough to even get up on plane in a 14ft aluminum boat. I took the cover off and looked and confirmed the throttle is open but not getting the rpms when in gear.

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