Complex sentence: Most commonly, production four-cylinder 600cc sport bike motors are used due to their availability and displacement, however there are many teams that use smaller V-twin and single-cylinder engines, mainly due to their weight-saving and packaging benefits.
Split into simpler sentences: Most commonly, production four-cylinder 600cc sport bike engines are used due to their availability and displacement. However there are many teams that use smaller V-twin and single-cylinder engines, mainly due to their weight-saving and packaging benefits.