EF1000is stalling

[3camp]

When I run the generator with the tempature about 30 degrees outside it will stall unless I keep the choke pulled part way out even after running for an hour, econ switch on or off. The loads are a 60 watt light 19 inch TV small fan on a wood stove. I did pull the carb off and clean and blow out ports but still did it.

[YamahaGenuineParts.com]

You did the right thing to start in pulling off the carb for cleaning,upon reassembly did you remove the jets for cleaning  and hold up to the light to ensure they were all clear through then Blow out with compressed air the entire carb body and reset float height and it should be good. If it will only stay running with the choke partially on this would lead me to believe the generator is running out of fuel.Some people take a carb of and clean it with out removing the jets,etc from the carb body. A complete dissasembly is required.

Also what is the wattage of the 3 items combined that are in use. Is it possible one is overloading the generator when it comes on, maybe the fan ? You could try unpluging one of them and recheck.
Cheers, and Merry Christmas !

[3camp]

I did check and blow out all the jets. there is one jet on the top of the carb that is open to dirty air what is that one for it was clean. All three loads were on all the time the fan is a small one on a wood stove. I tried it on my block heater which is 400 watts and it did it to. Is there any place that could have a vacuum leak in the head?
Thanks, Bruce

[YamahaGenuineParts.com]

Good morning, Well it sure sounds like the carb is nice and clean and you have to look for other possibilities.The pilot jet you mentioned being open, is normal.
Since you say it requires choke to keep running then it must still be running out of fuel.
You can try removing the gas cap to see if this eliminates a possible blocked fuel vent in the cap.

Another possibilty is an intake leak, to check this, you would need to spray around the carb,etc when its running an see if the engine speeds up. you can use contact cleaner or a similar product to do this.
Remember to keep an open mind when looking into these things as most root causes are usually stumbled upon while going through the process of elimination.
Good Luck, and have a very Merry Christmas !

[3camp]

I did spray carb cleaner around the mounting gasket rpm did not change. On the float adjustment it is plastic and the needle valve has a spring loaded stop pin so I do not think it is adjustable. Disconecting the ccv line to the fuel pump it still runs for a while. One other thing the 12 volt output is 35 volts no load 12 volts with a test light and 7.7 volts with a 5.5 amp load. 110 volt side the light stays steady unless the choke is pushed in then it will roll up and down and stall but takes 20 to 30 seconds before rolling when on econ.
Thanks, Bruce

[Stubbie]

Hi, I have just bought a used EF1000IS and have the same problem with the choke. I have done the carb cleaning with air and removed jet etc. Have you fixed your problem, if so what did you do to correct it. Thanks Jim

[mello moon]

stored my ef1000is for a year with fuel left in carb bowl. now runs only when i inject fuel directly into carb throat. cleaned all carb areas accessable without disassembly(except fuel bowl removal to check float) with sea foam to no avail. needle and seat operate ok as stops and starts flow when operate with finger. ran fine before storage so sure it is a varnish problem somewhere. unit only has a total of around 4 hours use.  

[robertbruce]

you might get away with it doing it this way.

Dont pull the carby apart, just remove it then remove the bowl. Dont remove the throttle unit, unplug it instead.
Then soak it in kero.... place the carby in the soaking disk with the float partially open and pour kero down the fuel line. This way the jet will definetly get some kero....after the first time i soaked mine it i was amazed at how much air was passing in comparison to the day before. It's evident my jet was partially blocked for a long time, this made it run a bit flaky.... now it has a beautiful smooth even run, with no hunting....eventually it will start to hunt, when it starts to hunt, i clean the bowl out... if it continues to hunt i replace the outer carby seal...