Big Bore kit still not cutting it for you? Then we have the Naraku Racing 4-valve cylinder head with 62mm combustion chamber to satiate your appetite for power. Increased flow, reinforced valve springs and larger valves (21 / 23mm). Suitable for Yamaha X-Max, WR, YZF-R 125 and other 125 mopeds with YI-3 engine. The carburetor or fuel injection system must be re-tuned (z. B. with Malossi Force Master). New models have the lambda sensor connection directly on the outlet. This must be closed on older models.

The cylinder head is suitable for following big bore cylinders: Naraku NK600.74, Polini 166.0101, Malossi M.3114852 and other cylinders with 62-64mm bore. Will be delivered as pictured. Combustion chamber: 62mm intake valves: 23mm exhaust valves: 21mm

Scope of delivery without shafts for roller cam followers.