Why is my boat only doing 5 mph with a 55 hp motor on a 21' pontoon

by Bob
(37807)

recently purchased this boat. I'm only getting 5mph on the lake. I'm being passed by row boats. What can I look for? I've changed the spark plugs. It has a hard start, but once she is warmed up it runs good. Just no power. While in the slip, and in neutral I can throttle it up and it sounds like its ready to fly, but once in gear and on lake, 5 MPH? Please help

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