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The Effect of Camshaft Modification on Fuel Consumption and AFR Value on The Honda Supra X 125 Motorcycle

JMEL : Journal of Mechanical Engineering Learning · Vol. 15 No. 1 (2026) · hlm. 31–39

DOI
10.15294/jmel.v15.i1.49227
ISSN
2252-651X
Terbit
2026-06-30
Penerbit
Universitas Negeri Semarang
Bahasa
eng
Lisensi
creativecommons.org/licenses/by/4.0

Abstrak

This study investigated the effects of camshaft modification and fuel variation on fuel consumption and air–fuel ratio (AFR) in a Honda Supra X 125 motorcycle. An experimental design was employed using three camshaft configurations standard, touring, and racing and two fuels: pure Pertamax and Pertamax blended with an octane booster. Fuel consumption was measured at idle and 5000 rpm based on the time required to consume 20 mL of fuel, while AFR was measured under idle conditions. Each test was repeated three times, and the results were expressed as mean ± standard deviation. At idle, the standard camshaft produced the longest fuel-consumption time, reaching 8.14 ± 0.09 min/20 mL with pure Pertamax and 9.22 ± 0.06 min/20 mL with the blended fuel. At 5000 rpm, the touring camshaft with the blended fuel produced the longest consumption time at 3.20 ± 0.05 min/20 mL. The racing camshaft consumed fuel more rapidly, with the lowest idle value of 6.57 ± 0.35 min/20 mL using pure Pertamax. AFR values decreased from 14.02 ± 0.06 for the standard camshaft with pure Pertamax to 13.45 ± 0.06 for the racing camshaft with the blended fuel. These findings indicate that camshaft geometry and fuel composition influence fuel-consumption characteristics and mixture richness. The standard camshaft was most efficient at idle, the touring camshaft performed best at 5000 rpm, and the racing camshaft produced the richest mixture.

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  • Tadulako University
  • Universitas Halu Oleo
  • Cenderawasih University
  • State University of Semarang
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Sonika MaulanaAfiliasi tidak diketahui5
Ahmad RoziqinAfiliasi tidak diketahui4
Wirawan SumbodoAfiliasi tidak diketahui2
Rizki SetiadiAfiliasi tidak diketahui2
Aldias BahatmakaAfiliasi tidak diketahui2
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A. Heris HermawanAfiliasi tidak diketahui2
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Nugroho Fajar SusantoAfiliasi tidak diketahui2
Hanif HidayatAfiliasi tidak diketahui2
Bambang SardiTadulako University1
Moh Ghifta HentuTadulako University1
Anti A JakariaTadulako University1
Nur Anisa KarimTadulako University1
Auliandari AuliandariTadulako University1
Thazkira AuliaTadulako University1
Sari ZulhijaTadulako University1
Fidya Tri WulandariTadulako University1
Nur AirinTadulako University1
Diva AvicennaTadulako University1
Wulan Mutiara SabaniTadulako University1
Laode SabaruddinUniversitas Halu Oleo1
La Baco SudiaUniversitas Halu Oleo1
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Irwan Sukri BanuwaAfiliasi tidak diketahui1
Siti Mutiara RidjayantiAfiliasi tidak diketahui1
Rahmi Adi BazenetAfiliasi tidak diketahui1
Khoirudin FathoniState University of Semarang1
Khoirul HudaCenderawasih University1
KriswantoAfiliasi tidak diketahui1
MUHAMMAD NUR FAIZINAfiliasi tidak diketahui1
Atta Putra HarjantoAfiliasi tidak diketahui1
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Sumber metadata: OAI-PMH (metadata jurnal) https://journal.unnes.ac.id/journals/jmel/oai, pertama di-harvest 6 Nov 2026, terakhir terlihat 8 Nov 2026.
Metadata asli (oai_dc) 
<oai_dc:dc xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/  http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
	<dc:title xml:lang="en">The Effect of Camshaft Modification on Fuel Consumption and AFR Value on The Honda Supra X 125 Motorcycle</dc:title>
	<dc:creator xml:lang="en">Hidayat, Wahyu</dc:creator>
	<dc:creator xml:lang="en">Abdurrahman</dc:creator>
	<dc:creator xml:lang="en">Iskandar, Ranu</dc:creator>
	<dc:creator xml:lang="en">Naryanto, Rizqi Fitri</dc:creator>
	<dc:subject xml:lang="en">Air-Fuel Ratio</dc:subject>
	<dc:subject xml:lang="en">Camshaft</dc:subject>
	<dc:subject xml:lang="en">Fuel Consumption</dc:subject>
	<dc:subject xml:lang="en">Honda Supra X 125</dc:subject>
	<dc:description xml:lang="en">This study investigated the effects of camshaft modification and fuel variation on fuel consumption and air–fuel ratio (AFR) in a Honda Supra X 125 motorcycle. An experimental design was employed using three camshaft configurations standard, touring, and racing and two fuels: pure Pertamax and Pertamax blended with an octane booster. Fuel consumption was measured at idle and 5000 rpm based on the time required to consume 20 mL of fuel, while AFR was measured under idle conditions. Each test was repeated three times, and the results were expressed as mean ± standard deviation. At idle, the standard camshaft produced the longest fuel-consumption time, reaching 8.14 ± 0.09 min/20 mL with pure Pertamax and 9.22 ± 0.06 min/20 mL with the blended fuel. At 5000 rpm, the touring camshaft with the blended fuel produced the longest consumption time at 3.20 ± 0.05 min/20 mL. The racing camshaft consumed fuel more rapidly, with the lowest idle value of 6.57 ± 0.35 min/20 mL using pure Pertamax. AFR values decreased from 14.02 ± 0.06 for the standard camshaft with pure Pertamax to 13.45 ± 0.06 for the racing camshaft with the blended fuel. These findings indicate that camshaft geometry and fuel composition influence fuel-consumption characteristics and mixture richness. The standard camshaft was most efficient at idle, the touring camshaft performed best at 5000 rpm, and the racing camshaft produced the richest mixture.</dc:description>
	<dc:publisher xml:lang="en">Universitas Negeri Semarang</dc:publisher>
	<dc:date>2026-06-30</dc:date>
	<dc:type>info:eu-repo/semantics/article</dc:type>
	<dc:type>info:eu-repo/semantics/publishedVersion</dc:type>
	<dc:type xml:lang="en">Peer-reviewed Article</dc:type>
	<dc:format>application/pdf</dc:format>
	<dc:identifier>https://journal.unnes.ac.id/journals/jmel/article/view/49227</dc:identifier>
	<dc:identifier>10.15294/jmel.v15.i1.49227</dc:identifier>
	<dc:source xml:lang="en">JMEL : Journal of Mechanical Engineering Learning; Vol. 15 No. 1 (2026): June; 31-39</dc:source>
	<dc:source>2252-651X</dc:source>
	<dc:source>10.15294/jmel.v15.i1</dc:source>
	<dc:language>eng</dc:language>
	<dc:relation>https://journal.unnes.ac.id/journals/jmel/article/view/49227/10729</dc:relation>
	<dc:rights xml:lang="en">Copyright (c) 2026 Wahyu Hidayat, Abdurrahman, Ranu Iskandar, Rizqi Fitri Naryanto (Author)</dc:rights>
	<dc:rights xml:lang="en">https://creativecommons.org/licenses/by/4.0</dc:rights>
</oai_dc:dc>