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The paper showed the effect of using Pertalite – methanol blend fuel on performances and exhaust emission of a four-stroke 125 cc single cylinder engine. Two different blends of fuels, 100% Pertalite – 0% methanol (M0) and 70% Pertalite – 30% methanol (M30), were experimentally tested. The experiments were conducted with different engine speeds ranging from 5000 to 8500 rpm. Power, torque, brake specific fuel consumption (BSCF) and exhaust emissions were measured during the test. It was concluded that M30 blend generated the largest power, 5.28 kW, at 7500 RPM. The M30 fuel also produced the highest torque, 7.1Nm, at 5500 RPM. For the specific fuel consumption, the best value of M30 fuel was 0.39 kg/kW.h, at 7500 RPM, while the M0 fuel has the best value at 7500 RPM that was 0.21 kg/kW.h. The M30 blend fuel decreased the emissions of carbon monoxide (CO), carbon dioxide (CO2), and hydrocarbon (HC).     Keywords: Pertalite, methanol, power, torque, exhaust emission

Effect of Pertalite – Methanol Blends on Performance and Exhaust Emission of a Four-stroke 125 CC Motorcycle Engine