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Rotax Micro / Mini / Jr. Max cylinder, part #223994. In good working condition.
Markings: 223994 / 220Z A / ..00 1 20W4 / PR / 4W A
Bore plating condition: Good, has a cosmetic blemish just below the center transfer port (see photo), but is smooth with no roughness or grooving.
Bore measurement (via caliper): ~53.96mm
External cosmetic condition: Good