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Hey I have a Yamaha ef2000is that wasn't run for awhile. I cleaned out all the old fuel, stripped down the carbs and cleaned out the Jets and carb.

The generator currently runs when I have the choke pulled out. Once I put the choke in the generator will start to surge.

The only time the surging stops when the choke is in, is if the solenoid is unplugged.

Any idea if the throttle control solenoid is bad?
 

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Any ideas what could be causing it to surge?
Likely running lean, if adding choke remedies it. Clean the main jet with a bristle, or replace it. You may need to go up a size or two if that doesn't resolve it. Is your altitude in sync with the main jet chosen?

Sounds possible that it could be your choke solenoid, as well? Does the surging stop if you hold the choke position constant?
 
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