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    Honda 25hp 4 stroke wont go above 4000rpm

    Hi I have a honda 25hp 4 stroke that whilst in the water will not go above 4000rpm and we are stuck at 8mph (sat nav) .it's on a pilot dory 15ft boat . It revs all the way to 6000+ with muffs on out the water I've tried trimming it whilst going but no joy Someone mentioned propeller pitch mine...
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