My Yamaha EF1000iS generator will start but stops running after roughly 30 seconds

SOURCE: I have a Yamaha EF1000is

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,
Carl

SOURCE: Trouble with idle speed

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

SOURCE: 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.

Testimonial: "Thanks for the help, it turned out that the intake jet was totally plugged. Cleaned it out and it runs great."

SOURCE: yamaha ef1000is was rained on, starts and runs

Sounds like the rectifier got fried. Moisture in these units is a dangerous thing. Even if you feel the unit sat long enough to dry ouit, it sometines will hold moisture in the electrical componants.