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We have a Honda GX120 engine attached to a 2'' water pump used to pump out the holding tanks of boats. For a while now when we start it will run for about a minute, start running rough and then stall out. It can be restarted again, right away, and the same thing will happen. We have installed a new filter in the tank, replaced the carburetor, removed the head to clean and inspect the valves (they look great) reassembled everything and the same problem exist. I don't know where to go from here. This problem started out slow and has gotten progressively worse to where it is today. After a few starts the spark plug is fouled black like it may be running too rich.

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The one thing you did not mention was the type of spark your recieving at the spark plug. I recommend that a spark tester be used, which can be purchased at an auto parts store. Set the spark plug tester gap for 10,000 volts, or a good 3/8". You should see a nice sharp blue spark. If you are recieving this kind of spark, then with valves closed or at top dead center apply 30 psi into the cylinder. This test will let you know if the valves are seated properly. If valves are not seated properly you will hear the air come out from the intake or exhaust. So, it is either your ingnition coils or warped valves.

Posted on May 07, 2009

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Sludge in the boat tank could plug up the pickup screen. I've also seen them plugged up by a foil oil bottle seal carelessly dropped into the tank.

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1 Answer

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Use a starting fluid spray directly into air filter.
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remove the carburetor float bowl and then use a screwdriver to remove the jet locking nut in the tube the bowl nut attaches.
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