ABSTRAKTujuan penelitian ini adalah: (1) Menyelidiki pengaruh pemasanganelektromagnet pada saluran bahan bakar dan penggunaan Ignition Booster padakabel busi dengan variasi letak terhadap emisi gas buang CO dan HC pada sepedamotor Jupiter Z. (2) Menyelidiki kadar emisi gas buang CO dan HC pada sepedamotor Jupiter Z dengan pemasangan elektromagnet pada saluran bahan bakar, danpemasangan Ignition Booster pada kabel busi dengan variasi letak pemasangan.Metode penelitian yang digunakan adalah metode eksperimen. Penelitiandilakukan di Laboratorium Otomotif Program Studi Pendidikan Teknik MesinFKIP UNS Surakarta. Alat yang digunakan untuk mengukur emisi gas buang COdan HC adalah gas analyzer (TYPE STARGAS 898). Populasi penelitian ini adalahsepeda motor Yamaha Jupiter Z tahun 2007 dan sampel penelitian adalah sepedamotor Yamaha Jupiter Z tahun 2007 bernomor mesin 2P2675042. Analisis datayang digunakan dalam penelitian ini adalah analisis varian dua jalan.Berdasarkan hasil penelitian dapat disimpulkan: (1) Terdapat pengaruhsignifikan antara diameter kawat lilitan elektromagnet terhadap penurunan emisigas buang CO dengan hasil sebesar 1.712 % vol menggunakan kawat lilitanelektromagnet diameter 0,20 mm, sedangkan yang menggunakan kawat lilitanelektromagnet diameter 0,30 mm sebesar 1.738 % vol. (2) Terdapat pengaruhsignifikan antara diameter kawat lilitan elektromagnet terhadap penurunan emisigas buang HC dengan hasil sebesar 377 ppm menggunakan kawat lilitanelektromagnet diameter 0,20 mm, sedangkan yang menggunakan kawat lilitanelektromagnet diameter 0,30 mm sebesar 359,6 ppm. (3) Terdapat pengaruhsignifikan antara letak pemasangan Ignition Booster terhadap penurunan emisi gasbuang CO dengan hasil terendah sebesar 1.529 % vol, menggunakan perlakuanpemasangan Ignition Booster dekat busi. (4) Terdapat pengaruh signifikan antaraletak pemasangan Ignition Booster terhadap penurunan emisi gas buang HCdengan hasil terendah sebesar 476 ppm, menggunakan perlakuan pemasanganIgnition Booster dekat busi. (5) Terdapat pengaruh signifikan antara diameterkawat lilitan elektromagnet dan letak pemasangan Ignition Booster terhadappenurunan emisi gas buang CO dengan hasil terendah sebesar 1.476 % vol,menggunakan perlakuan pemasangan lilitan kawat diameter 0,30 mm dan IgnitionBooster dekat busi. (6) Terdapat pengaruh yang signifikan antara diameter kawatlilitan elektromagnet dan, letak pemasangan Ignition Booster terhadap penurunanemisi gas buang HC dengan hasil terendah sebesar 211,3 ppm, menggunakanperlakuan pemasangan lilitan kawat diameter 0,30 mm dan Ignition Booster dekatbusi.Kata kunci: Gas buang CO dan Gas buang HC, kawat lilitan elektromagnet,Ignition BoosterABSTRACTThe purpose of this research are: (1) Investigate the effect of installationthe electromagnet on the fuel lines and the use of Ignition Booster on the sparkplug wires with a variation location of the exhaust emissions gas of CO and HCon Jupiter Z motorcycles. (2) Investigate the exact value of the levels of exhaustemissions gas HC and CO on a motorcycle Jupiter-Z with the installation of theelectromagnet on the fuel line, and Ignition Booster on the spark plug wires withvariations location of installationThe research method used was experimental method. The research wasconducted at the Laboratory of Mechanical Engineering Education Program FKIPUNS Surakarta. The tools used to measure the exhaust emissions gas of CO andHC was a gas analyzer (STARGAS 898 TYPE). The research population were amotorcycle of Yamaha Jupiter Z 2007 and the sample was motorcycle of YamahaJupiter Z 2007 with machine numbered 2P2675042. The Data Analysis used inthis research was two-way analysis of variance.Based on the results of research were: (1) There was significant effectbetween the electromagnet winding wire diameter to the reduction of exhaustemissions gas CO with amount of 1.712% vol, used electromagnet winding wirediameter of 0.20 mm, while those using electromagnetic winding wire diameter of0.30 mm amount 1.738% vol. (2) There was significant effect between theelectromagnet winding wire diameter to decrease HC exhaust emissions gas withamount of 377 ppm using electromagnet winding wire diameter of 0.20 mm,while those using electromagnetic winding wire diameter of 0.30 mm amount359.6 ppm. (3) There was significant effect between the installation of IgnitionBooster to the reduction of exhaust emissions gas CO with the lowest amount of1.529% vol, using treatment Ignition Booster installation near the spark plug. (4)There was a significant effect between the installation of Ignition Booster to thereduction of exhaust emissions gas of HC with the lowest amount of 476 ppm,using treatment Ignition Booster installation near the spark plug. (5) There wassignificant effect between the electromagnet winding wire diameter and locationof installation Ignition Booster to the reduction of exhaust emissions gas CO withthe lowest amount of 1.476% vol, using a treatment installation of winding wirediameter of 0.30 mm and Ignition Booster near the spark plug. (6) There wassignificant effect between the electromagnet and the winding wire diameter,location of installation Ignition Booster to the reduction of exhaust emissions gasof HC with the lowest amount of 211.3 ppm, using a treatment installation ofwinding wire diameter of 0.30 mm and Ignition Booster near the spark plug.Keywords: CO and HC exhaust gas, the electromagnet winding wire, IgnitionBooster