If the governor spring is broke, the engine will race.
If the thrust bearing has bit the big one, the engine won't rev up.
Fix the fuel supply, then time the carburetor to the governor. Engine off, disconnect the throttle rod at the yoke in front. Throttle lever to full. Adjust the length of the throttle rod such that the pin just slips through easily with the carburetor at wide open throttle.
After that, the screw on the bottom of the governor controls surging. Remove the cap, loosen the lock nut, and tighten the screw a little at a time to stop the surging.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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