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  1. J

    '59 Johnson V4s-10 Compression ?

    I have a 1959 Johnson V4s-10 "fat 50" I have got most of the bugs out and it is running smooth. But tends to foul plugs after 3-4 hours. I am running hard pulling skiers and tubers. Fuel mix 32:1 87 octane. I did a warm compression test: all cylenders read 89-90 psi. This seems pretty low...
  2. J

    '58 Johnson V4-S10 50Hp Cuts out

    My motor runs great pulls my skiers at 20 mph for about 3/4 mile looses power and cuts to idle or dies, after a rest of about 1 minute runs fine for the same distance. I rebuilt the carbs, insatalled an inline fuel filter, checked the vaccum release on the tank, compression is 88-90 on all...
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