<![CDATA[This study evaluates the effect of a voltage stabilizer on the performance of a Yamaha MX King four-stroke motorcycle. The investigation focused on engine power, engine torque, and fuel pressure in the electronic fuel injection system. An experimental method was applied by comparing the standard condition without a voltage stabilizer with five stabilizer output-voltage settings: 13.5 V, 14.0 V, 14.5 V, 15.0 V, and 15.5 V. Each condition was tested three times using a chassis dynamometer at Pekajaman Dyno Test Workshop, Yogyakarta, while fuel pressure was measured using a fuel pressure tester. The results show that the effect of the voltage stabilizer was more evident at higher output voltages. The 15.5 V setting produced the highest average power of 34.97 HP and a maximum power of 35.1 HP at 11,500 rpm, representing a 0.6 HP increase compared with the standard maximum power. The same setting also produced the highest average torque of 24.20 Nm and a maximum torque of 24.3 Nm at 8,750 rpm, or 0.1 Nm higher than the standard maximum torque. Fuel pressure increased from 2.4 bar in the standard condition to 2.5 bar at 15.0 V and 2.6 bar at 15.5 V. These findings indicate that a voltage stabilizer can improve power, torque, and fuel pressure at high voltage settings, although further durability and safety validation is needed before application above the manufacturer's normal electrical range.]]>
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