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One plug fouled on X300

Georgiaboy I have an unusual problem. One plug (left) on my JD X300 is always fouled sooty black; the other is normal. The fouled plug shows no signs of oil, just jet black soot, and the mower burns no oil between changes. I change the plugs when I do annual maintenance in the spring.
For troubleshooting, I've checked the spark on both plugs and both are good up to 20,000 volts. I just stopped there, no need to continue in my opinion. This is way past the Small Engine setting on the tester. I also checked compression and the 'normal' cylinder tested at 95 psi while the 'fouled' cylinder showed 120 psi - exactly opposite of what I was expecting.
I purchased the mower new about 5 years ago. It now has about 300 hours on it. And one plug is always fouled. Other than that, I can't tell it's affecting the operation/running in any way.
So, for the $64,000 question, what's causing this?

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