Posts: 3508
Location: Elk River, Minnesota | Hiya,
Could be a few things... All of it will depend on whether or not it a fuel related or electric related.
My "hunch" is you have a fuel/spark issue.
First thing I would do is pull the plugs. If they are wet, I would suspect that the plugs either fouled or just need replacement. Heck...I would just replace the plugs anyway. The plugs are inexpensive and it would eliminate them as a cause.
I would also take a look at replacing the fuel filter on the engine as well. If that has not been changed, it could very well have just enough build-up on it that fuel flow is not taking place.
If this gets your engine going, I would highly suggest getting a can of mercury powertune or equivalent OMC/Bombardier product and do a deep clean through the carb throat. Basically what you do is get your engine warm and set it to high idle. Start spraying the product into the carb throat (alternating carbs) to where it starts to sputters and hopefully dies. when that occurs, continue spraying cleaner into each carb throat for a little while longer. Then let the engine sit for an hour. Finally, go out and run it at speed for a a while to clear out all possible gunk that has been cleaned out. There will be a bunch of white smoke, but that is the cleaner...it will go away fairly quickly.
I would start there...fairly cheap and is good maintenance for the engine and see where you are at. Last thing to consider would be the fuel line/bulb. If it is older and not flexible, it would be advisable to replace that as well.
As a last resort, I would check the timing of the engine. My 99 Johnson 50hp went out of timing to where it had trouble starting and staying running at idle. once I adjusted the timing back to 0 tdc, it started with barely a turn of the key and purred like a kitten.
Steve
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