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Posted on Jan 02, 2017
Not familiar with that specific motor but had similar vintage smaller HP Johnsons. From my experience it sounds like it could be that the high speed carb adjustment is too lean. What I would try is running the backing off the high speed screw 1/4 turn to 3/4 turn, then test. If works better, screw back in in 1/8 turn increments until the problem recurs, then back out 1/4 turn and leave it there.
Posted on Jun 30, 2009
sounds like your mix is off and it's fowling the plugs. probably too rich. make sure the level in your carb bowls isn't too high. Really sounds like you should clean and bench set your carbs. Especially if a plug change helps but doesn't last, then it's got to be your fuel mix, or maybe timing.
Posted on Jul 24, 2009
Ihave a 1991 70 hp Johnson outboard thats hard to start the first time but starts good after that. Seems to be flooded. Starting rpm seems to be low.
Posted on Jul 25, 2009
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