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    Intermitent spark on 1968 5 hp johnson top cylinder only

    So here's the deal. Earlier I had posted problems with this engine being difficult to start while warm. Now the problem is that I only have sporaticly intermittent spark on the top cylinder. Here's what's been done so far to try to track down the problem: 1) All ignition related items have been...
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    1968 5 HP Johnson trouble starting when warm

    My 1968 5 HP Johnson is somewhat easy to start when cold, 7-8 pulls usually does it. When the engine is warm it's a real bear to start. In fact I usually wait for it to cool off then give it a try. Carb has been disassembled, thoroughly cleaned and rebuilt. New plugs points and condensers...
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    1968 4 HP Johnson starting troubles

    I have the above described engine that is difficult to start after having run long enough to reach full operating temp. then stopped for a short time and then attempted to start again. If the engine dies after having run at low speeds it's a real bear to re-start. I've tried combinations of...
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    How to find gear ratio information

    On a previous thread steelspike suggested a gear ratio in the 2:00 range for a pontoon boat. (I think the gist of the suggestion was the closer to 2:00 the better and I'm guessing that this would be analogous to looking for a lower geared rear end for a car or truck.) When shopping for a motor...
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    pontoon engine choice

    New to the site and hoping for some helpful information. Presently have an older, late 80s-early 90s, Merc. 35 on a 24' pontoon. I now it's slow as molasses on a cold January morning in Michigan but I kind of like it that way. With that having been said I'd like to increase the HP to somewhere...
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