John Deere 425 blown gasket

I probably already know the answer to this but just want to make sure. My 425 used to run fine, it always smoked a little but still would mow. Suddenly it will not carry enough rpms to mow effectively. It will engage the deck, but not fast enough to mow. I cleaned the plugs which were pretty bad, did not make a difference. Decided to check the compression. One side was about 190lbs, but the other side showed zero compression. I assume this means I blew the head gasket on that side. I am surprised that the engine runs as well as it does if I have no compression on one side. Any thoughts??

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