I had issues with a 20 hp kohler command. One cylinder would foul plug like yours on the right. Other cylinder looked like your plug on left. I would switch plugs around and the good cylinder would clean carbon off plug while the bad cylinder would dirty it up again. Did the switch every 10 hours.
Boys at repair shop told me that could be either a bad head gasket or burnt valves. I did a compression test and leak down test. Both tests showed nothing wrong.
Then I bought new head gaskets, removed just the head on bad side, lapped in exhaust and intake valve. Problem solved. I didn't have to worry about valve adjustments. Kohler command has hydraulic valves.
My point, compression tested the bad cylinder. It was only a few pounds below the good side, yet under running conditions the bad side didn't have enough compression to run hot enough. Before valve job, I purchases an IR thermometer from HF and exhaust temps on bad side were 200 degrees less than the good side.
BTW, both my cylinders used same carb, which has no adjustments. Did you grind valves?
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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