Question about Yamaha 2500 Watt Industrial Inverter Generator YG2800i

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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?

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  • 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.



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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

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Carl

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.

Aloha!

Posted on May 17, 2009

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CarlGehrke
  • 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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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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This generator is equipped with an auto choke. What is likely occurring is as the engine warms up the choke is returning to the normal choke off run position leaning the mixture two lean to maintain operation of the motor.

This is occurring because the residual fuel that was left in the carburetor has evaporated and the gum residue is reducing the fuel flow through the carburetor. When the choke is applied the mixture is rich enough to support running and as the choke returns on its own to the run position the mixture leans out and the generator stalls..

Override the choke when the engine is starting to falter to confirm the problem. Continuing to attempt to run the engine possibly adding a carburetor cleaner additive to the gas will likely return the unit to normal operation.

If attempting to enrich the mixture by applying choke when the engine begins to falter does not work then a fuel flow problem to the carburetor may be the root cause. I would look for a plugged fuel filter or restricted fuel flow from the tank to the carburetor. What is happening is when the unit is at rest the carburetor is filling with gas and as it is running because of a restricted fuel flow the level lowers in the carburetor bowl resulting in a mixture to lean 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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