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...
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...
