Cylinder kits: Cylinder kits is the abbreviation of Cylinder kits. It is embedded in the cylinder of the cylinder block and forms a combustion chamber with the piston and cylinder head. The cylinder set of a motorcycle refers to a complete set of three parts: cylinder block, piston, and piston ring. Some of them also come with a piston pin. Cylinder set means a set. In general, when the motorcycle burns oil, it is best to replace the cylinder, piston, and piston ring as a whole. The repair effect of only replacing one piece alone is not good. It is possible that the oil will burn again soon after use, and the whole set of parts will be replaced. The matching is good, and errors are not easy to occur. When repairing or selling parts, a set of cylinder blocks, pistons and piston rings are called "cylinders". Now that there are many motorcycle accessories and the price is relatively cheap, there are almost no boring cylinders, and the repair effect of boring cylinders is not as good as replacing qualified new cylinders.