Yamaha Electrical Supplies - Recent Questions, Troubleshooting & Support

Most likely, the carburetor needs cleaning.
There are two main jets powering your Yamaha, the pilot, or sometimes called the idle jet, and the main jet. If the pilot jet is clogged, the main jet will take on the load, and the governor will modulate the carburetor to keep it running, causing the surging problem. Likely, the problem is less, or even nonexistent if the choke is on, or the generator is under load.
Search the web for help on cleaning this pilot/idle jet.

Yamaha EF2400iS... | Answered on Jun 04, 2019

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

Yamaha 2500 Watt... | Answered on May 07, 2019

I like this link for a manual. Check it out. Free User Manuals and Owners Guides ManualsOnline com

Yamaha 2500 Watt... | Answered on Apr 05, 2019

Is it overloaded? That's the most common reason!

Yamaha... | Answered on Mar 24, 2019

Make sure there are no vacuum leaks on the engine manifold side of carburetor. There are 3 o 4 pieces on the engine side so inspect well.

If no leaks on engine manifold side then likely there's a blockage somewhere in the carburetor high speed circuit. Most economical solution is chinese knock-off for ~$20 US delivered.

If you can't find a cheap replacement then you'll need to do a deeper clean of carburetor by removing welch plugs and submerge in carb cleaner. You will need new welch plugs (kit) and likely kit will cost more than a knock-off carb.

Before tearing down carb, you could try Seafoam fuel treatment... probably less the 50:50 chance it will clear.

Yamaha Ef1000is... | Answered on Mar 07, 2019

If your generator cannot run normally, please follow the guide in this article to solve your problem.
If diesel generators fail to start, you can analyze the causes from fuel system failure, electric starting system failure, insufficient compression pressure in the cylinder and the low ambient temperature and other factors.

Yamaha EF2400iS... | Answered on Sep 10, 2018

4 stroke engine?? syn 5w30 or straight 30w

Yamaha... | Answered on Aug 27, 2018

Remove the cover, and take off the broken cord, replace it with new.

Yamaha... | Answered on May 20, 2018

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