Winoko, Y.A. and Sudarmanto, J.H. 2025. The Effect of Number of Spark Plug Ground Electrodes and Octane Rating on Single Cylinder Engine Performance. International Journal of Marine Engineering Innovation and Research. 9, 3 (Jul. 2025), 512–519. DOI:https://doi.org/10.12962/j25481479.v9i3.4912.