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  1. O

    prop selection

    What is the proper size prop to run with a 1999 40hp merc 4 stroke on an 18 ft crest pontoon rated for a 1700 lb load, but normally carries bout half that?? Currently has a 13 x 26 ?
  2. O

    '99' 40hp 4-stroke stalls on throttle up

    my '99 mercury 40hp, 4 stroke, on an 18' pontoon will not go past about 3000rpm and motor dies when i try to push throttle past about 1/2 throttle. Starts fairly easy, idles rough for about 2 minutes then smooths out and idles very smooth and quiet and IF I increase throttle slowly it will...
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