51/2HP气冷式单汽缸四卫程汽油引擎,体积小切面薄,一般厚度的4—5公厘左右;但转速达每分钟2,l00转,所以铸件要有较高机械性能,绝对不容许有任何铸造上的毛病,特别对汽缸体、汽缸头及凸转轴等的检验规格要求更严。 51 / 2HP air-cooled single-cylinder four-door gasoline engine, the small size of the small section, the general thickness of 4-5 mm; but the speed of up to 2 per l00, so castings have higher mechanical properties, absolutely not Allow any casting problems, especially on the cylinder block, cylinder head and convex shaft inspection specifications and more stringent requirements.