The YZ250F is a motocross racing bike powered by a 249cc, liquid-cooled, 4-stroke, DOHC, single-cylinder engine. The “F” at the end stands for 4-stroke. According to the model year system, the following year’s model was released around the summer of each year, but since it was a competition model, the specifications were changed many times, both big and small, and the competitiveness was increased. The 2019 model is finally equipped with an auto-start. This is due to the presence of lightweight