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I have K & N filters on all of my motorcycles. I clean and oil when needed.

That cross hatch is in order to help the piston rings “seat” or wear into the cylinder. They are no longer needed after the rings seat.

When the valve face and valve seats in the head wear, the clearance is reduced.

Try starting a Briggs with a worn camshaft, or a two-stroke with carbon build-up on the head and piston, and you will find out first-hand about compression.