Question about Yamaha 2500 Watt Industrial Inverter Generator YG2800i

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Yamaha EF2800i generator will only run with the choke engaged. Will not hold load. Unit was in storage for 8 months while I was out of country. Added fresh gas, checked spark plug, let warm up for several minutes. Unit has only 12 hours of runtime.

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Whenever storing the generator for any length of time after use, it should be allowed to run out the gas from the carburetor by first shuttinig off the fuel petcock, to avoid the gas in the float bowl from deteriorating and gumming up the small idle passages. With the mandated ethanol additives that are used, the gas breaks down much faster than pure gasoline, so it's more crucial to do this prestorage maintenance.
Luckily the Yamaha incorporates a fuel petcock to make this simple to do, unlike other generators that don't enable the fuel to be turned off independently of the engine.

Posted on Apr 07, 2012

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Remove & Check Float bowl on carburettor for any foreign matter. If there is any, it could have got into jets causing engine to run lean (only run with choke) and not be able to carry load in this state. A cleanout of the carby would not hurt and check the fuel tank for any sediment as well.

Posted on Aug 24, 2010

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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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1 Answer

Yamaha 5200d it starts and runs 2/3 minutes and shuts down oil is full low oil lite does not light up carb is clean


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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1 Answer

2002 yamaha venture 600 won't idle unless choke is engaged


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
Dirt Rider Magazine
My KZ only runs choke fully engaged
https://www.tradebit.com/filedetail.php/278958138-yamaha-600-700-triples-snowmobile-service-repair
OEM parts for Yamaha
Yamaha Owner Manuals

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1 Answer

My 4 year old Craftsman 10.0 HP Genter OHV 5600 Watt 8600 Surge Power generator starts and runs good in the choke position, however when you try to take it from choke to run, it dies. Will it do any damage...


Not that i am aware of, however, I suspect that as soon as you load it up it will die again as the load will call for greater speed, and too much fuel from the choke position will cause it to die again.

What I suspect is that your carburator is clogged up at the jets and is not metering the air fuel mxture properly. You may have to disassemble the carburator and clean it. Since the government has mandated that gasoline contain 10% alcohol, it has become a night mare for small engines that are not used very often. The alcohol is very hydroscopic (retains water) and during the off use period, the alcohol evaporates and leaves the water behind to mix with gunk and clog the needle valves.

Try removing the old gasoline. Refill the machine with fresh gasoline and add some "SeaFoam" (an additive) or any other brand additive that will help disolve the built up gunk in the carburator. Remove the air cleaner and try spraying a carburator cleaner down in the air intake while the machine is running, this way the air passages may clear while the new gasoline may dislodge the built up gunk. Note: The carb cleaner will stall the engine.

It is probably wise to run the gas tank dry before storage and only fill when the machine will be used. Stabil is an additive for storage, and it did it's job before the alcohol edict. I am not sure that Stabil will allow long time storage. (more than 3 months) SeaFoam can be purchased at WalMart, stabil is on the shelf of most small engine sales rooms such as Sears.

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1 Answer

Can the ecu memory be flashed on a yamaha EF2800iportable generator? My 2800i will start and run for about 90 seconds and then shuts down. Carb is fine. Two issues: 1. It is not generating...


It sounds like its running on the gas in the carburetor and not the gas filling back up to run more, I bet you have a gas supply problem to the carburetor! Try Babbitts Yamaha Partshouse online...

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