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Outboard motor won't run under load

150 hp mariner outboard runs, but don't have power to get boat on plane. Runs good in reverse, but will has no power in forward.

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I have 1969 5hp Johnson. Starts and runs good, but will only push a 14ft row boat slow at low to medium rpm. When at higher rpm the the motor just revs up and the boat slows down to almost nothing just like it has seaweed around prop.Any help would be great.

Posted on Mar 13, 2010

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Aaron67 you have a spun prop. Needs to be replaced or re-hubbed

Posted on Apr 11, 2010

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I have just purchased a small tinny boat and it has a 1991 15 Hp mariner on it it runs but has a small fault with the throttle system. Is there somewhere I can download a free repair manual.

go google and type in--- workshop manual for 1991 mariner outboard 15 hp--- if there is a manual look for pdf version for down load
you problem will be rubber bits in the jets of the carby from failing rubber components in the fuel system

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40 hp mariner outboard runs good in gear ,but will shut-off in neutral ,won,t idle

You need to pull the cover and track where the trottle cable goes to on the motor. If you have someone open and close the throttle while you're watching you will find the linkage that it controls. There should be some kind of an idle ajustment screw there that you can readjust to increase your idle.

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No power

sounds like a carb problem, you should have them cleaned and re-built

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