Symptoms indicate a fuel starvation problem, not a governor issue!
When the engine starts surging try slowly closing the choke. If you find a choke setting that causes the surging to go away, fuel starvation is the problem.
Some possible causes:
- Restriction in the fuel line supply (obstruction in the gas tank covering the fuel outlet, plugged sediment bowl, plugged carb inlet screen, etc.) - Blocked carb orifice - specifically the high speed jet - Vacuum leak (look at the carb to manifold and manifold to head gaskets)
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
... [Read Article]
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