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Often, surging is caused by carburetor problems. If the idle and power circuit in the carburetor are not both set properly and functioning properly, the carburetor will not respond to a small movement of the governor, and a bigger correction will be made by the governor, causing surging. Also, the length of the linkage rod from the governor to the carburetor is important. In general, the carburetor throttle shaft should reach the end of it's rotation in the "open" direction just before the governor reaches the limit of it's movement in that direction. Hopefully, you have the original linkage and carburetor, so the geometry of the levers and linkage is as it was originally. Is the governor belt drive? If so, be sure the belt is in good condition, and reasonably tight. If the governor is external, be sure it is properly full of oil. If all else fails, and you have to tear into the governor, check for the weight pivots either being tight (sticky), or loose and sloppy. Check the thrust bearing, and the fingers on the weights that touch the thrust bearing, and the forked lever that touches the other side of the thrust bearing for wear (flat spots) that affect the smooth movement of the governor parts. Check the bearings, and the bushings on the input/output shaft(s).
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