The Honda CBF series encompasses multiple models, each with its own specific engine type. However, a commonly known model in the CBF series is the Honda CBF125, which features a single-cylinder, four-stroke engine.
Please note that there are other CBF models produced by Honda with different engine types, such as the CBF250 or CBF500. If you are referring to a specific CBF model other than the CBF125, please provide the model name or number for more accurate information.