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Rotax Micro / Mini / Jr. Max cylinder, part #223999. In good working condition.
Markings: 223999 / .001 25P6 / 6 / 220T / T / 6R / AB0
Bore plating condition: Good, shows some discoloration but no grooving, will clean to Excellent with hone.
Bore measurement (via caliper): ~53.98mm
External cosmetic condition: Fair