<![CDATA[Emisi CO dan HC pada sepeda motor berkarburator berkaitan dengan kondisi pembakaran dan karakteristik aliran udara masuk. Penelitian ini mengevaluasi filter udara berbasis serabut kelapa pada Yamaha 28D karburator dengan membandingkannya terhadap filter standar pabrikan (OEM) dan filter racing. Pengujian emisi mengikuti SNI 09-7118.3-2005 pada kondisi idle dengan 30 pengukuran per variasi; data emisi dianalisis menggunakan Welch ANOVA dan Games-Howell, sedangkan aliran udara dan performa mesin dianalisis secara deskriptif. Filter serabut kelapa menghasilkan rata-rata CO 3,89% dan HC 194,8 ppm, masing-masing 21,06% dan 52,00% lebih rendah daripada filter OEM. Selisih daya maksimum antarfilter sebesar 0,06 HP secara deskriptif. Dengan biaya produksi Rp36.640 per unit, ACER penurunan HC sebesar Rp704,62 per 1%. Temuan ini menunjukkan potensi serabut kelapa sebagai media filter alternatif pada kondisi pengujian, dengan kebutuhan verifikasi pada kendaraan dan kondisi operasi yang lebih beragam. Carbon monoxide (CO) and hydrocarbon (HC) emissions from carbureted motorcycles are associated with combustion conditions and intake airflow. This study evaluated a coconut fiber air filter on a carbureted Yamaha 28D motorcycle against an original equipment manufacturer (OEM) filter and a racing filter. Emissions were tested at idle according to SNI 09-7118.3-2005 using 30 measurements per condition and analyzed with Welch ANOVA and the Games-Howell test, while airflow and engine performance were evaluated descriptively. The coconut fiber filter produced mean CO and HC emissions of 3.89% and 194.8 ppm, corresponding to reductions of 21.06% and 52.00% relative to the OEM filter. Its mean airflow velocity at 3000 rpm was 8.18 m/s, while the maximum power difference among filters was 0.06 HP. With a production cost of Rp36,640 per unit, the HC ACER was Rp704.62 per 1% reduction. The findings support further evaluation of coconut fiber as an alternative air-filter medium.]]>
