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Yamaha EF4600DE Generator Help needed

Pop's and coughs when put under a load. Even just shutting the ECONO switch off so the engine will rev up. Carb completely rebuilt. If I put under a load or shut the econo switch off while holding the governor arm and slowly release the governor arm it will run fine. But if the governor arm moves quickly, it starts to cough and pop like the timing were off on an old chevy V8. Should the vaccum break release slowly?

Posted by John Bemis on


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SOURCE: generator hard to start and backfiring

Sound like you've done things in the correct order, tecumseh's are notorious for carb problems if you let as sit in them. Backfiring is timing related (flywheel key) or valve problems. I would take a closer look at the exhaust valve I don't believe it is closing all the way.

Posted on Mar 16, 2009



  • 117 Answers

SOURCE: engine won't maintain constant rpm

Hello There

Try cleaning or replacing the spark olug.

Hope this helps.

Many Thanks

Posted on May 22, 2009



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SOURCE: kohler lp shuts down

What you need to know is there enough fuel going to the regulator. It should be 7 to 11 inches Water Column. If not your problem may be not enough fuel. That includes when the heater in your house kicks on and what ever gas appliance you may have. Once you verify that you need to figure out if you have the proper pressure coming out of the regular on the inside of the generator. Next I would look at compression of the cylinders. It may need new piston rings.

Posted on Oct 09, 2009


  • 151 Answers

SOURCE: Troy-Bilt 5550 generator. After starting if I move

improper setting in the fuel needles of the carb. what size is the engine? brand?

Posted on Dec 24, 2009

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Sounds like the throttle control motor is not adjusting the engine speed to compensate for the load. Does the generator rev up to full speed if you turn OFF eco with NO load?
Funny thing, I have one on my workbench that is doing pretty much the same thing. Runs on eco, revs up with eco off with no load, coughs, sputters and dies with a load in either mode. I will update with what I find when I figure it out in the next week or so. Have a new carb on order.

I swapped the carb and it made no difference. Still backfiring (rather dramatically) and won't stay running. I see on some other posts that Valve lash will cause this. It makes total sense as the exhaust valve gap actually tightens as the engine wears which would keep the exhaust valve slightly open when it ain't supposed to be allowing raw fuel to enter the muffler.
With this one I can believe it as it has a ton of hours on it and I know they have never been adjusted.
I will try to get a chance to do it over the weekend and update this post when I do.

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