Not sure what kind of device you're talking about. Generator? Tractor? Chainsaw? Lawnmower? Motorscooter?
Surging on any engine with a governor is often due to a blocked carburetor idle circuit. Under low load, the throttle will close to the point where the idle circuit starts to take over. If the idle circuit is blocked, the RPMs will droop, causing the governor to open the throttle, kicking in the high-speed circuit. RPMs raise, throttle closes and the cycle repeats.
Cleaning out all the carb passages and jets with a fine wire will usually fix the problem. This is tough to do on newer carbs, so it may be necessary to replace the carb. Closing the fuel and running the carb dry before you store the engine will prevent this in the future.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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