ANALYSIS OF YAMAHA NMAX MOTORCYCLE PERFORMANCE WITH VARIATIONS IN PISTON DIAMETER AND FUEL TYPE
DOI:
https://doi.org/10.52158/mpq01b62Keywords:
motorcycle engine performance, , bore-up modification, fuel octane rating, fuel consumption, engine knockAbstract
Small-displacement motorcycles like the Yamaha NMAX are commonly modified with bore-up piston kits and higher-octane fuel, yet the interaction between these modifications remains empirically unexamined. This study evaluated the effects of piston diameter variation and fuel octane rating on NMAX engine performance by comparing a standard 58 mm piston against a 4 mm oversize piston paired with Pertalite (RON 90) and Pertamax Plus (RON 95) fuel. Dynamometer testing across 2000–9000 RPM measured torque, power, and fuel consumption, complemented by qualitative observation of knock behavior and thermal dynamics. Results showed the oversize piston increased peak torque by 15–18% and power by 12–16%, with 8–12% higher fuel consumption. Critically, a synergistic effect emerged: Pertamax Plus provided only 3–5% power gain with standard pistons but substantial additional improvements with the oversize piston while reducing fuel consumption penalty from 8.6% to 6.1%. Knock onset shifted from 6800 RPM (oversize + Pertalite) to 7200 RPM (oversize + Pertamax Plus). These findings demonstrate that mechanical and chemical modifications function as complementary variables requiring concurrent optimization. The research provides evidence-based recommendations for balancing performance, efficiency, and reliability.
Downloads
References
[1] “Spesifikasi Yamaha Nmax 2025 - Detail dan Fitur | Oto.” https://www.oto.com/motor-baru/yamaha/nmax/spesifikasi (accessed Dec. 03, 2025).
[2] J. Heywood, “Internal Combustion Engine Fundamentals | McGraw-Hill Education - Access Engineering.” https://www.accessengineeringlibrary.com/content/book/9781260116106 (accessed Dec. 03, 2025).
[3] R. Stone, “Introduction to internal combustion engines,” p. 494, 2012.
[4] G. T. Kalghatgi, “Fuel anti-knock quality-part I. Engine studies,” SAE Tech. Pap., 2001, doi: 10.4271/2001-01-3584.
[5] J. : Jurnal, I. Mesin, L. W. Damayanti, and A. Septiyanto, “The Effect of Stroke Up and Bore Up on The Performance of Honda Verza Motorcycle,” J. Inov. Mesin, vol. 6, no. 1, pp. 44–49, Apr. 2024, doi: 10.15294/JIM.V6I1.11178.
[6] E. Widodo, D. Arbiantara, and Iswanto, “The Analysis of the Effect of Bore Up Variation on Engine Performance,” R.E.M. (Rekayasa Energi Manufaktur) J., vol. 8, no. 2, pp. 63–68, Aug. 2023, doi: 10.21070/R.E.M.V8I2.1641.
[7] . Gideon Perdana Marbun, “ANALISIS PENGARUH BORE UP TERHADAP PERFORMA MESIN SEPEDA MOTOR 4 LANGKAH YANG MENGUNAKAN BAHAN BAKAR PREMIUM DAN PERTAMAX,” Jul. 2020, Accessed: Dec. 03, 2025. [Online]. Available: http://repository.upnvj.ac.id
[8] A. A. Faturachman and N. Robbi, “ANALISIS PENGARUH PERUBAHAN UKURAN PISTON PADA MOTOR MATIC HONDA VARIO 150,” pp. 76–79.
[9] A. Prihatno and A. Hendrawan, “Performance of spark-ignition engine at various fuel octane numbers,” Appl. Res. Smart Technol., vol. 2, no. 1, pp. 34–40, Jul. 2022, doi: 10.23917/ARSTECH.V2I1.149.
[10] E. Julianto, D. Stiawan, F. Fuazen, and E. Sarwono, “EFFECT OF IGNITION SYSTEM IN MOTORCYCLE TO PERFORMANCE AND EXHAUST GAS EMISSIONS WITH FUEL RON 88, RON 90, AND RON 92,” SINTEK J. J. Ilm. Tek. Mesin, vol. 14, no. 2, pp. 74–79, Dec. 2020, doi: 10.24853/SINTEK.14.2.74-79.
[11] A. Kurnia Ismawan, S. Wiyono, and N. Aklis, “PENGARUH PEMASANGAN ALAT PENINGKAT KUALITAS BAHAN BAKAR TERHADAP UNJUK KERJA DAN KONSUMSI BAHAN BAKAR SPESIFIK MOTOR BENSIN,” Media Mesin Maj. Tek. Mesin, vol. 11, no. 1, Jan. 2017, doi: 10.23917/MESIN.V11I1.3193.
[12] D. S. Firmansyah, “Pengaruh Boring Silinder Liner terhadap Performa Motor 2 Tak 110 CC,” 2018.
[13] Z. P. Arianto, M. Atsafiqi, H. Artikel, T. J. Saputra, L. Fauzi, and D. nur Amirul Huda, “Dampak Penggunaan Bahan Bakar Pertalite Terhadap Unjuk Kerja Daya, Torsi Dan Konsumsi Bahan Bakar Di Sepeda Motor Bertransmisi Otomatis,” Etn. J. Ekon. - Tek., vol. 2, no. 9, p. 788, 2023.
