Abstract: A method of manufacturing a cylinder for an internal combustion engine, which is manufactured by a process wherein a raw cylinder body having an insert core left remained therein is obtained using an insert core comprising a cylindrical body having almost the same outer diameter as the diameter of bore of the cylinder, and a scavenging port-forming portion projecting radially outward from the cylindrical body and having almost the same cross-sectional configuration as that of the scavenging port, the cylinder bore of the raw cylinder body thus obtained is then subjected to a boring to remove the cylindrical portion of the insert core, and the scavenging port-forming portion of the insert core which is left remained in the raw cylinder body is removed by making use of a press.

Abstract: A method of manufacturing a cylinder for an internal combustion engine, which is manufactured by a process wherein a raw cylinder body having an insert core left remained therein is obtained using an insert core comprising a cylindrical body having almost the same outer diameter as the diameter of bore of the cylinder, and a scavenging port-forming portion projecting radially outward from the cylindrical body and having almost the same cross-sectional configuration as that of the scavenging port, the cylinder bore of the raw cylinder body thus obtained is then subjected to a boring to remove the cylindrical portion of the insert core, and the scavenging port-forming portion of the insert core which is left remained in the raw cylinder body is removed by making use of a press.

Abstract: A hand-held cleaner is disclosed which is capable of performing suction operation to suck fallen leaves, refuse and the like and blowing operation to drift them together selectively with ease, and as opposed to the conventional one, which is not required to be changed in a manner of holding handles to greatly change position of a body including an engine depending upon type of operation, thereby enabling various operations to be performed easily and improved operational efficiency and manageability to be realized. The hand-held cleaner 10 comprises a blower body 10A including a prime mover 12, and a blower suction path 20 and a blower blow-off path 30 which are located on said blower body 10A in such a manner that the axis S of the former and the axis F of the latter are substantially in parallel with each other when viewed in plan, said blower suction path 20 being adapted to be rotatable.