2001 Mariner 60hp Bigfoot fourstroke losing high end rpm

Uptidegirl

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Sep 9, 2013
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We have developed a problem on our 60hp fourstroke bigfoot that we are losing rpm once past 1/2 throttle it starts fine runs sweet idles good it has had a new fuel pump new plugs the carbs all seem good. On a dynometer it reaches full rpm once in the water the motor will just not get past 4500 rpm and the engine just bogs down. The prop is a 15inch pitch and has a slight bit of damage but nothing major
 
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