<![CDATA[The aims of this research are: (1) to investigate the ignition timing effect to the fuel consumption of 2007 Supra-X 125 motorcycle, (2) to investigate the input voltage of electrolyzer effect to the fuel consumption of 2007 Supra-X 125 motorcycle, (3) to investigate the interaction between ignition timing and input voltage of electrolyzer to the fuel consumption of 2007 Supra-X 125 motorcycle. This research used experimental method. The sample of this research was 2007 Honda Supra-X 125 with engine number JB81E1108989. Fuel consumption were measured using 8 Km road test on Prambanan-Piyungan street, Yoygyakarta, according to SNI 7554-2010. The data were collected from the motorcycle?s fuel consumption which is designed in variations of input voltage electrolyzer (0 volt, 4 volt, 8 volt, and 12 volt) using standard ignition timing (15O BTDC), early ignition timing (18O BTDC), and late ignition timing (12O BTDC). Two way analysis of variance was used to analyze the data. The result of this research has shown that (1) there were significant effect between the variation of ignition timing to the fuel consumption of 2007 Supra-X 125 motorcycle, (2) there were significant effect between the variation of input voltage electrolyzer to the fuel consumption of 2007 Supra-X 125 motorcycle, (3) there were significant interaction between ignition timing variation and input voltage of electrolyzer variation to the fuel consumption of 2007 Supra-X 125 motorcycle. The lowest fuel consumption was produced at 18 O BTDC ignition timing with 12 Volt input voltage electrolyzer was 13.98 cc/Km.]]>
