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I am not sure I understand. The governor seems to be blipping the throttle butterfly, but as far as lean goes, there does not seem to be a way to adjust anything in the carb unless there is an epa plug I have missed somewhere. Any pointer as to how to resolve would be appreciated.

I am working on a 5 year old Murray with a OHH60 engine. It would not start, but after cleaning the carb almost all appears fine and it seems to run well under power. However, the governor seems to be commanding a continuing engine surge, about one vrooom per second at what is supposed to be...