Abstract :
Motorbikes are vehicles that are often found around us and are not spared from modification, one of which is the 2010 Honda Supra The hotter it gets, the temperature in the vehicle becomes hotter and causes instability in the engine. So in this research, the author made modifications to the engine by adding an oil cooler and changing the volume of engine oil to 1000 milliliters, with the aim of knowing the difference in temperature and engine performance before and after adding the oil cooler. The results of this research concluded that by adding an oil cooler, the temperature on the motorbike decreased to 69.2 Celsius, which before adding the oil cooler was 76.2 Celsius, engine performance (increased) on average by 9.8 Hp. /KMH because the engine oil moves to the oil cooler for the cooling process, which is different before the oil cooler was added, the engine performance was stable at 9.5 HP/KMH.