There's nothing you can "see" just by "looking" at this stage to indicate that the engine needs to be rebuilt or not.
The way you tell if an engine needs to be overhauled is when it is RUNNING. Hard to start even after ignition and carburetor tune-ups, blowing blue smoke, knocking... Those are things that indicate the need for arebuild. Carbon only indicates that you have an engine that has run at some point in its lifetime, not that anything is wrong.
Compression check. You're looking for consistent numbers. Don't know what an 8N needs but I'd expect anything above 90PSI, and again consistent, would be adequate.
If the tractor is doing what you want it to do, and isn't hard to start, blowing smoke, or knocking, fix the head gasket and leave the rest alone.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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