2004 Aprilia Atlantic 500 specs Aprilia Atlantic 500, manufactured or sold in 2004, continuously variable variable-speed gearbox gasoline (petrol) engine with displacement: 459 cm3 / 28 cui, advertised power: 29 kW / 39 hp / 39 PS (net), torque: 43 Nm / 32 lb-ft. Acceleration on gears: The times show how fast a motorbike accelerates on high gears, without gear reduction. The lower the times, the drive is more relaxing and driver less often needs to change gears during overtaking or hill climbing. Practical tip: if the 60-100 km/h on 4th is higher than 11 sec and 80-120 km/h on 5th higher than 15 sec (or higher than 19 sec on 6th), the motorbike will be felt as rather slowly reacting and will require downshifting very often in road conditions.