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Honda GX120 engine keeps stalling out

We have a the above mentioned Honda 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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  • wyancey Apr 20, 2009

    I have similiar problem on small concrete extruder machine.



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The gx 120 is only 3.5 hp, that's not a lot. For a 2" pump I would want twice that. You could look up engineering specs on other 2" pumps to see what they use. I've seen lawn mowers with more hp.

Posted on May 04, 2009


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