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An electronic controlled rapid burning system with a high energy, dual-spark plug ignition system in a high speed LPG engine with a sole LPG-fueled port fuel injection (PFI) system for the steady state lean operation is discussed in this paper. A Multi-channel SI engine Combustion Process Analysis System was developed in this research. The synchronizing and asynchronous ignition timing can be realized by ECU and the control strategies according to the engine operation conditions. Test results showed that the lean mixture flame propagation was improved by the enhanced ignition energy intensity in this system. To cooperate with the combustion chamber and the spark location, the flame propagation distance was shortened for rapid burning.