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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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