The cylinder sleeve of a motorcycle refers to a complete set of three components: cylinder block, piston, and piston ring. Some also come with a piston pin. The cylinder sleeve refers to a set of cylinder block, piston, piston ring, and gasket. Generally, when a motorcycle burns engine oil, it is best to replace the cylinder block, piston, piston rings and gaskets as a whole set. Replacement of just one piece alone is not effective and may cause the engine to burn oil again soon. Also, replace the entire set. The components match each other well and are not prone to errors. When repairing or selling parts, a set of cylinder blocks, pistons, piston rings and gaskets is called a "cylinder set". Nowadays, because there are many motorcycle accessories and the prices are relatively cheap, there are almost no boring cylinders, and the repair effect of the boring cylinder is not as good as replacing it with a new qualified cylinder.