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ISASISAS

Journal Journal of Applied Mechanical Engineering Technology and InnovationJournal of Applied Mechanical Engineering Technology and Innovation Abstract

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.

Conclusion

This research demonstrates that Yamaha NMAX engine modifications function as integrated systems where mechanical and chemical parameters must be optimized concurrently.The oversize piston delivers substantial performance gains, but only when paired with appropriate fuel octane.The study validates the practical modification wisdom that bore-up kits benefit significantly from higher-octane fuel, extending knock-free operation and improving the power-to-consumption efficiency ratio.

Future Research

Penelitian lebih lanjut perlu dilakukan untuk menguji durabilitas komponen mesin dalam jangka panjang dengan konfigurasi modifikasi yang berbeda. Selain itu, studi komprehensif mengenai pengaruh variasi ukuran piston dan jenis bahan bakar terhadap emisi gas buang juga penting untuk dilakukan, mengingat isu lingkungan yang semakin krusial. Terakhir, penelitian yang melibatkan pengujian di dunia nyata dengan profil beban transien yang beragam akan memberikan gambaran yang lebih akurat tentang kinerja dan efisiensi modifikasi mesin NMAX dalam kondisi penggunaan sehari-hari, sehingga dapat memberikan rekomendasi yang lebih relevan bagi pengguna dan mekanik.

References

1. The Effect of Stroke Up and Bore Up on The Performance of Honda Verza Motorcycle | Jurnal Inovasi Mesin.... doi.org/10.15294/JIM.V6I1.11178The Effect of Stroke Up and Bore Up on The Performance of Honda Verza Motorcycle Jurnal Inovasi Mesin doi 10 15294 JIM V6I1 11178
2. PENGARUH PEMASANGAN ALAT PENINGKAT KUALITAS BAHAN BAKAR TERHADAP UNJUK KERJA DAN KONSUMSI BAHAN BAKAR... doi.org/10.23917/MESIN.V11I1.3193PENGARUH PEMASANGAN ALAT PENINGKAT KUALITAS BAHAN BAKAR TERHADAP UNJUK KERJA DAN KONSUMSI BAHAN BAKAR doi 10 23917 MESIN V11I1 3193
3. Performance of spark-ignition engine at various fuel octane numbers | Applied Research and Smart Technology... journals2.ums.ac.id/index.php/arstech/article/view/149Performance of spark ignition engine at various fuel octane numbers Applied Research and Smart Technology journals2 ums ac index php arstech article view 149

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