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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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  • Tom  Barnes
    Tom Barnes Apr 19, 2009

    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.

  • Kimbo too May 11, 2010

    you said that you replaced the carb, is the replacement a newie, or s/hand?. if its a s/hand one did you check the float level? try adjusting it. don't run the engine for long periods without an air cleaner either, that will shorten the life of the rings and valve seats.

  • billcurle May 11, 2010

    not sure if you have pump in to small area creating lack of air.take air filter out & run with plastic cover only.have found filters to be very restrictive.also check oil may have petrol in it,

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SOURCE: pressure washer stalls

Pressure washers work under very dirty conditions, no wonder they encounter engine problems. Here are a few pointers from a former pressure pump tech. The unloader is a source of engine overloading however this can easily be checked with a pressure guage attached to the gun with a tee fitting having the guage and the normal tip used for the unit. The pressure should never rise over rated pressure. The pressure should drop considrably when trigger is released. The life of the pump and engine can be increased by setting max pressure to 75% of rating. Most engine problems are from following conditions:
Leaking or misadjusted valves; clogged muffer /spark arrester; weak spark coil that is about to fail completely; kill switch/oil sensor wiring and or sensor mal function; gas cap not venting properly causing vacuum in tank and wet or dirty air filter.
All these problems easy to check, fastest repair is to disconnect oil sensor wire to check oil safety system. Then temp replace coil with known good coil. Loosen muffer bolts to check for clogged muffler. Temp run engine without gas cap to check for vacuum. Finally if everything fails, run the engine with carb cleaner spraying directly into the intake. If the engine continues to run with carb cleaner then the problem is fuel delivey and faulty carb. enjoy

Posted on Dec 01, 2008

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jeremythious
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SOURCE: 91 honda civic dx. Starts, runs for a few seconds then stalls

Try pounding on the gas tank with a rubber mallet or similar tool. (careful not to dent the tank) Try starting it. If it runs, replace the fuel pump (it's nfg). I've diagnosed numerous fuel pumps this way. Remember the pump needs to be replaced, if you drive it, you don't know when it'll fail for good. Hope this helps. Please post the results.

Posted on Feb 08, 2009

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SOURCE: 91 honda civic dx 1.5L quit running properly.

bro, check ur main relay. its under the dash. replace it, check also ur distributor(replace it). and also your ECU

Posted on Feb 22, 2009

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SOURCE: 98 Honda Valkyrie Tourer, engine stalls

Check vacuum line from #6 intake runner (port side rear cylinder) to the fuel petcock valve. The valve is vacuum operated for safety. It cuts off fuel to the carbs when the engine is shutdown. Hose could be cracked or diaphram in valve is cracked. Easy to inspect the valve.

Posted on Jun 07, 2009

SOURCE: My 1993 Honda TRX 90 Fourtrax has issues...

You will have to clean the carburator, blow the jets with compressed air,check the float level too and reset.
Good luck.

Posted on Jul 19, 2009

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