The purposes of this research are to: (1) Analyze the using of Ignition Booster to the udtorque and engine power on Yamaha Mio Soul motorcycle 2010. (2) Analyze the variety of udspark plug to the torque and engine power on Yamaha Mio Soul motorcycle 2010.udBased on the research can be concluded that: (1) The using of Ignition Booster couldudincrease torque and engine power on wheel axis. Its because of the using of Ignition Booster udcould repair ignition system, So the torque and engine power on wheel axis increase. (2) The udusing of variety spark plug could increase torque and engine power on wheel axis. Its udbecause of better electrode design on spark plug could increase fire fragment quality, so theudtorque and engine power on wheel axis increase. (3) The using of Ignition Booster and udvariety of spark plug could increase torque and engine power on wheel axis. Its because of udthe using of Ignition Booster could repair combustion system and better electrode design on udspark plug could increase fire fragment quality, so the torque and engine power on wheel udaxis increase. (4) Maximum torque obtained with use ignition booster and Iridium Spark udplug, which is 4.95 ft.lbs at 6000 rpm. Maximum Engine Power obtained with use ignition udbooster and Iridium Spark plug, which is 6.49 ft.lbs at 8000 rpm.
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