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I have a yamaha jet engine that has 28 hp output. I have recently had the engine serviced because of an idling problem. The 3 carbs were cleaned and dirt and water were found in the bowls. They were cleaned and blown out along with the jets. The o rings and gaskets looked good and were not replaced. When I first start the engine it runs well for about 1/2 hour then it stalls if I lower the idle speed (to *****). Then I can only run it with the choke wide open. If I shut the engine down for a while (1/2 hour) it runs well again for another 1/2 hour and then the problem starts up again. I am now a frustrated fisherman!
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Check the fuel tank vent, remove gas cap when engine start stalling, if engine picks back up tank not venting. Check for fuel restricktions in fuel pickup, lines and filters. I have seen the fuel filter installed upside down and it cause the engine to run like what you are describing. -
Thanks. I did remove the gas cap and it didn't help. There is a plastic fuel filter that I have removed and clead out. It would be impossible to install it upside down. Also, I have blown out all of the hoses. None of this helped. I do believe that fuel is be restricted, but I don't know how.Comment
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pickup tube filter? some factory tanks are installed with them, i always remove. if choking helps after warm, them the carbs are still dirty. try to isolate the carb issue with a spray bottle of gas, spraying in each throat and listening for the change, or choking each individually to find the culprit.
3 carbs and 28 HP??? is this a jet ski??Comment
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The engine is a 1987 Yamaha 40G. I am starting to accept that the carbs need to be cleaned again. I will take it to a marina and have it repaired so they can test it on the water to make sure it is adjusted properly. I also forgot to mention, when I am forced to run it with the choke wide open I notice gasoline in the water behind me.Comment
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