Motorised scooter

The motorcycle has a motor (2) that is fixed on a frame (1), and driving pinion (5) which is directly or indirectly driven by the motor and is coupled to a drive wheel (7) by a traction element (6). A rear swing arm (10) is supported by bearings (8,9) and pivoted at frame about a pivot axis. The pivot axis of the swing arm is coaxial with a rotation axis of the driving pinion. The traction element is accommodated in swinging portion (10a) of the rear swing arm. The swinging portion is partially filled with oil.