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This page is retained for technical reference, scooter compatibility, servicing information and historical product documentation.
Browse compatible alternativesNaraku racing 4-valve cylinder head for Yamaha Cyngus/ BWS 125cc 4-stroke air-cooled scooters with big bore cylinder kits.
The valves and springs have been stiffened to allow the engine to be pushed further than ever. The number of valves has of course been doubled allowing more power to be extracted from the engine. The inlet and exhaust outlet has been opened to 25 and 24mm respectively.
Valve diameter:
Inlet: 22.3mm
Exhaust: 20.3mm
Naraku NK600.48