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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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