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  1. S

    prop or jets

    I have an older 70 horse johnson that runs well at Denver altitiude 5,000 ft, but wont develop the RPMS at higher altitute,, above 7,000,, one thought is I need a different prop at the higher altitude, This is a 60 something engine with the three seperate carbs. I haven' been able to make any...
  2. S

    pops

    I have an old but very reliable 60 something johnson 70HP, It runs well in Denver 5,000 ft in altitude. When I take it up above 7,000 ft it wont turn the RPMS to move faster then a small snail. I am running a 13 3/4 by 15, Tried a lightweight composite prop same results. Any suggestions? I...
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