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Features: Replacement valve set suitable for the Naraku Racing 4-valve cylinder head NK600. 75 for Yamaha X-Max, WR, YZF-R 125cc and other 125cc scooter or moped with YI-3 engine. Delivery includes: 2x inlet valve (23mm) and 2x outlet valve (21mm). Replacement valve set, only suitable for the Naraku Racing 4-valve cylinder head NK600.75. 2x inlet valve: 23mm; 2x outlet valve: 21mm.