While older motor scooters were seen as staid and non-creative in their body structure, the ones of today have been highly upgraded in look as well as technology. For example, these scooters had two stroke cycle engines and were air-cooled until recently. However, more scooters today have a four stroke engine, and are water cooled. Also, while older scooters had smaller wheels, the modern scooters have bigger wheels, almost equal to the motorcycles, so that it maintains its balance well on the roads.