A motorcycle comprising a frame, a front wheel coupled to the frame, and a rear wheel coupled to the frame. An engine is supported by the frame and is adapted to propel the motorcycle. An oil tank is supported by the frame and includes an inlet defining an inlet aperture having an inlet axis. An oil tank cap is rotatable about the inlet axis between an inserted position and a sealed position. The oil tank cap has a movable portion that is movable substantially along the inlet axis between a retracted position and an extended position.