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Abstract. This experimental study was carried out to understand the characteristics of a liquefied petroleum gas (LPG) compared to pertamina fuel product such as pertamax and pertamax turbo in spark ignition engine. In our project, liquid fuel delivery system was conducted by the carburetor and convertion into LPG fuel supply system was controlled by Arduino uno. The experimental result showed that liquid fuel was reach more better motor performance than the LPG, the highest power was reach by pertamax turbo of 7,5 HP at engine rpm 5.750 rpm, followed by pertamax of 6,05 HP at engine rpm 6.050 rpm, and the lowest power was 2,61 HP was reach by LPG at 11.650 rpm. On the otherhand, HC, and CO of LPG fueled engine resulted in the lowest emissions benefit over a wide range of engine operating condition.