Question about Yamaha 2500 Watt Industrial Inverter Generator YG2800i

2 Answers

I have a Yamaha EF1000is Inverter/Generator. I am having trouble with the idle speed when the choke is all the way in. It chokes itself out. What can be done?

Posted by Caplinger146 on

  • 1 more comment 
  • Anonymous Apr 03, 2009

    have to choke to keep it running after warming up.

  • bliffle Apr 22, 2009

    The EF1000is was running, then sputtered and died. I added gas and tried to restart and the only way it would go is if I used full choke and then it runs poorly and dies anyway after a few seconds.

    I let it sit overnight and it started up immediately but only ran 5 minutes before it died. With full choke I can start it but it soon dies. Then I have to let it sit for several minutes.

    Oil level seems to be OK so I don't think it's the low-oil shutoff.

    I thought maybe it was clogged fuel line but when I cracked the small bleed screw under the carb gas flowed down the transparent tube.

  • Ed Greene
    Ed Greene Dec 06, 2016

    0pen carb and clean out bowl and jets with air or carb cleaner. and change oil. fill till it runs out.



2 Answers

Carl Gehrke

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Not sure exactly what you mean but here is what I know:

1 - You shouldn't have to use any choke at all once the engine has started and warmed up, if you have to apply some choke to get the engine to run correctly then you have a carb problem. Clean and service the carb and see if that makes it all better.

2 - The idle speed is set by a small screw on the body of the carb itself, if it's set too low the engine can shut off rather than idle. Make small adjustments until you get it right.

3 - Dirty air cleaners can cause problems with idle

4 - fouled and/or misgapped spark plugs can cause idle problems

Please rank this answer,

Posted on Dec 02, 2008



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Another possibility would be that the muffler is clogged preventing exhaust flow ...

Remember one-cylinder four-stroke technology is basically:
1. **** ; 2. squeeze ; 3. bang ; 4. blow
That last part is just as important as the first three.


Posted on May 17, 2009


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Carl Gehrke

  • 169 Answers

SOURCE: Trouble with idle speed

Go see my answer to the other copy of this question here.

Posted on Dec 02, 2008

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1 Answer

I have a Yamaha ef1000is generator for less than a year. WhenI push in the choke after starting it shuts down

If you have not properly shut down the unit after use you will have likely had fuel remaining in the carburetor. The fuel will have evaporated while the unit was not in use leaving a film behind. This residue will plug and interfere with the fuel passages and metering orifices of the carburetor. If the unit runs with the choke on it is likely the carburetor is dirty. Be running the engine the carburetor will possibly clean itself. Make sure you remove any old fuel from the machine and replace with fresh. Allow the unit to run for an extended length of time attempting to return the choke to the run position. If you are able to return the choke to the run position you are on the way of solving this problem. You may need to run it additional time to completely purge the residue.

Additives are available to clean the carburetor and as a last resort if running with fresh fuel doesn't' return the motor to normal you may try it. For best results after mixing and running with the additives leave the unit overnight which may help to remove the remaining residue.

The shelf life of gas containing ethanol is about 30 days. In the future it is best to run the unit dry leaving ot fuel in the carburetor.

All else fails you will need to have the unit serviced by a small engine service center.

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Why does it surge with choke pushed in?

I guess your air cleaner needs cleaning , take air cleaner off and try it. Its starving on gas, may have water in gas tank and would cause this also or plug fuel filter if it has one..

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Hi, Anonymous and the usual suspects are:
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For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have a nice day.
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Generator will start and run with the choke on but stalls when you push the choke off.

Carburetor needs cleaning. You can try adding a gas preservative to the fuel and see if that helps, otherwise start by removing bowl on carburetor and cleaning.

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Yamaha EF1000is, Will no run without choke on

It is starved for fuel. PROBABLY needs to have carbureator cleaned and adjusted OR the fuel filter may be clogged.

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Generator only runs with the Choke all the way out. Stops when pushed in.

Only a suggestion. Sounds like the carberator has trash in it. You need to try to clean out the carb and check out the gas tank to make sure that that there is no trash in the tank. When opening the choke lever that allows another way for the fuel to get to the engine in order for it to run.

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Trouble with idle speed

Go see my answer to the other copy of this question here.

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