1) Cylinder block /Cylinder head Cylinder block: Cast iron cylinder from original factory, working surface processed by honing process, shorten engine running-in period and reduce oil consumption. Cylinder head: From original factory, good thermal effect to avoid overheating of parts in combustion chamber. 2) Crankshaft and camshaft Crankshaft and camshaft : Supplied by original factory, with high strength and good wear resistant performance in working, with a long service life.