With the latest V.2 Cylinder kit series from NARAKU, we can offer a more advanced product. The piston has 2 additional CNC-machined oil grooves in the piston skirt, which collects engine oil to lubricate the cylinder bore and improve characteristics in extreme circumstances. The molybdenum coating aids the crucial running-in period. 2 oil recesses and a groove at each bearing point ensure the gudgeon pin is adequately lubricated. The 39mm cylinder from this kit corresponds to the power and dimensions of the original 50cc and is therefore road legal. Suitable for all GY6 50cc Chinese-built 4-stroke engines. This cylinder kit is much more affordable than to buying original spare parts individually. The quality is also significantly better than the Chinese manufacturers Delivery contains:. Cylinder, piston, piston ring set with oil scraper rings, gudgeon pin, gaskets and circlips for the gudgeon pin.