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The lean burn gas engine ignited by pilot oil is a promising alternative combustion system [1]. First, pilot flame is auto-ignited, then ignition source propagate toward lean gas mixture. Despite much research work conducted experimentally [2] [3], little phenomenological understanding has been made on ignition characteristics of this combustion system. This makes improvement of engine performance a difficult task. The main objective of the present study is to reveal the combustion phenomena and ignition characteristics by visualizing the combustion chamber while the engine is operated under the dual-combustion mode and the pure diesel mode at the same amount of light diesel-oil. An open-chamber type single cylinder research engine is employed, together with an endoscope suitable for observing a small space. Endoscope was inserted into the combustion chamber to allow continuous observation of the very fast combustion phenomenon that was photographed using a high-speed video camera.