Question about RTO New Yamaha Inverter Ef2400is / Yamaha Generator Ef2400 / Perfect For Camping, Emergency Home Use, Construction Sites And More!

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Motor will not run with the choke off & rpm's go up and down

This is a generator we use for camping and around our
property. I bought it last year and followed all procedures.
We store it with Stabil in the gas tank and try to run it every
week. Now when I run it, it will only stay running with the choke
part way on and it cycles between low and high RPM's. What is up??

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  • kennkey May 03, 2009

    I have the same problem. Is there any way to clean the carb without disasembly? Thanks.

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Sounds like your fuel has gone stale, drain tank and put in fresh fuel, with no additive, better to drain the tank after use than use additives

Posted on Feb 16, 2009

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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.

Nov 19, 2015 | Yamaha Power Generators

1 Answer

Honda generator


The running on choke is caused by a fuel restriction. Check the fuel flow from the tank to the carburetor.Change the fuel filter if it has one. If its good, then the restriction is in the carburetor. The generator is shutting down due to the low rpm coming from the engine. A carburetor rebuild may need to be done.

Oct 19, 2013 | Power Generators

1 Answer

My 2 Yamaha ef2000is generators will only run anything in my camper that requires power (ac,tv, or microwave) unless the choke is on about a 1/4 of the way.


dirty carby jets. it is not receiving enough fuel thereby needing the choke. remove carby and clean jets thoroughly or simply try removing air filter & squirting carby cleaner into carby throat whilst revving engine several times, this sometimes works enough to solve problem.

Jun 30, 2011 | RTO New Yamaha Inverter Ef2400is / Yamaha...

1 Answer

I bought a used coleman powermate 5000 generator, I replaced the spark plug and fuel filter, it finally started up,it would only run in the "choke" position it ran about 10 minutes and then shut down, I...


What brand of engine & horsepower is it?Also about how long was it stored or last time it was run? The reason I ask is if it was stored with gas in it & a fuel stabilizer wasn't added to it,your primary jet is plugged in the carburetor(reason it will only run while choked).

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Onan 5000 surges


Governor is "hunting. An adjustment should take care of it. nothing more. Take it to camping world and they know what to do.

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Coleman Powermate generator will not start.


Changed plug since last year?Choke adjustment? try premium gas?

Aug 13, 2009 | Power Generators

1 Answer

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.

Aug 11, 2009 | RTO New Yamaha Inverter Ef2400is / Yamaha...

1 Answer

Makita G11oo portable generator. starts on choke. cuts off run


Just noticed your question... If you still need a little help:
1. If the gas is from last year, drain the tank and the carb bowl and replace gas with new. Visually inspect the inside of the tank ..be sure there's no sediment that needs to be cleaned out.
2. remove air cleaner and make sure it's not plugged or dirty
3. plug the spark plug and clean with spray carb cleaner.
4. At end of season, mix some gas stablizer in with the fuel to keep it from going bad while in storage.

Let me know how it goes..
k

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Runs rough when choke pushed all the way to run position


Where can i obtain a manual for the 5500 gas generator

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