Naraku Cylinder Head [Adjustment] - 125-180cc Cylinder head optimization with larger valves and larger channels and 59mm extended combustion chamber. The cylinder head fits all Naraku tuning cylinder sets [160ccm - 180cc] for Chinese 125cc GY6 engines. (scooter, quad and buggy). To further increase the power, a sporty camshaft can also be installed with altered timing Important: When using the Kymco 125 models Art.Nr must also: 741.04.18 (timing chain) be ordered and installed! The original Kymco timing chain should not be used due to the flat design.