I battled a 20 hp kohler command. One cylinder was 200 degrees cooler, 700 vs 900 degeees F. The spark plug would turn black in 10 hour. The cause of the problem, valves, It had good compression, but not enough to get complete combustion. It passed both compression and leak down tests. I just had to grind the valves.
A leaky head gasket and manifold gasket could also cause problems.
IR thermometers to measure high exhaust temps are cheap at HF.
Good luck. I'm sure you won't give up until you fix it.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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