<![CDATA[This study aimed to analyze the effect of Air Fuel Ratio (AFR) variations obtained through tuning of a Juken 5 programmable ECU on the performance of a Yamaha Aerox 155 engine. The study used an experimental method with a chassis dynamometer, comparing the initial run condition with the tuned condition at a target AFR of 12.8:1. Testing was conducted under Wide Open Throttle (WOT) conditions using Pertamax RON 92 fuel, with maximum power and torque as the main performance parameters. The results showed that the initial condition with an AFR of 10–11 produced a maximum power of 20.07 HP and torque of 10.33 ft-lbs. After final tuning at an AFR of 12.8, maximum power increased to 22.54 HP at 10,260 rpm, representing a 12.3% increase, while maximum torque increased to 11.59 ft-lbs at 10,200 rpm, representing a 12.2% increase. These results indicate that stabilizing the AFR at 12.8:1 was associated with improved engine performance at high engine speeds. However, the relationship was not statistically tested, so the observed improvements cannot be considered statistically significant.]]>
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