Khambali, Khambali, Yuniarto Agus Winoko, and Mochamad Choirun. “Improving the Performance of a 4-Stroke Motorcycle With Variation Diameter and Mass Piston”. Indonesian Journal of Advanced Research 3, no. 7 (July 31, 2024): 1127–1140. Accessed May 10, 2026. https://journal.formosapublisher.org/index.php/ijar/article/view/9914.