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PTO side piston? sounds like a bad seal.

As far as the base gasket goes, OEM base gaskets for polaris have a small layer of silicone on the gasket material. It is only on one side and it has to be installed towards the cylinder - not the base.

Check for the failure mode on the piston, was it overheat, lack of lubrication, excessive piston clearance, etc. Analyzing the piston, cylinder and head will tell you what the failure mode was.
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