Abstract: An ignition spark plug which comprises an insulator containing a center bore, a center electrode extending through the center bore in an insulator; a circular plate-type center electrode attached to and extending from one end of said center electrode, said circular plate-type center electrode including: a plurality of grooves provided at the periphery of the circulate plate-type electrode defining a tooth wheel for expanding the size of the spark in an ignition chamber; and a ring electrode disposed at an end of a threaded metal shell extending from a metal housing and spaced apart from said circular plate-type center electrode, whereby the improved ignition spark plug provides an excellent starting ability of the engine, completes the combustion of the fuel in the ignition chamber, and prevents the exhaust gas from fuming out.

Abstract: An air flow system for an internal combustion engine which includes a cylindrical air cleaner, the cylindrical air cleaner divided into a centrally disposed air swirling zone and a laterally disposed filter zone; and a swirling device disposed in the air swirling zone, the swirling device including a plurality of flexible vane members which extend radially toward the periphery of the swirling device for increasing air flow, at least one elongated slit disposed in each of the plurality of vane members for preventing the generation of negative pressure behind the vane members, and at least one groove disposed on the surface of each of the plurality of vane members for preventing the generation of negative pressure behind the vane members and increasing the force of the swirling air flow, whereby when air is introduced through said filter zone and into the air swirling zone, a strong swirling force is generated which is retained by the reduced resistance created in the air flow through the vane members.

Abstract: An air flow system for an internal combustion engine comprising an air cleaner and a swirling device disposed therein and having a plurality of vanes with at least one elongated slit for causing the air to swirl thereby improving the properties of the air fuel mixture and improving the performance of the engine.

Abstract: An air flow system for an internal combustion engine comprising an air cleaner and a swirling device disposed therein having a plurality of vanes for causing the air to swirl thereby improving the properties of the air-fuel mixture and improving the performance of the engine.