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I have a 345 that surges. It runs off the governor, cycles back and forth. I cleaned out the carb. it did not seem to make a difference. If I advance the choke it smooths out so I suspect a lean condition, but I do not know how to fix the problem. Hoses, fuel filter are new. Removing the gas cap is no help.
 

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When does it surge? Did you adjust the idle mixture screw?

Also, not sure how you cleaned out the carb, but it usually takes a minimum of a 24 hour soak to disolve all the varnish.

Given it's a lean condition, you could also have a bad gasket on the intake.
 
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