1. ABSTRACTYAMAHA MOTOR CO., LTD. has developed the YCLS system described in this report. The YCLS provides electrical support for a mechanical oil pump to offset its disadvantage. This system can reduce oil consumption at low engine speeds. As a result, it achieves its aim of reducing exhaust smoke, thus improving the dirty image of 2-stroke gasoline engines. Since the system reduces oil consumption in actual operation, it can be said that the technology contributes to resource saving.