sentences:  The Kawasaki 454 was discontinued in favor of the Kawasaki Vulcan 500 in 1990, with no increase in horsepower despite the larger engine size.The reason for the switch to the nearly identical early Vulcan 500 was that manufacture of the 908 cc Ninja had ceased in 1990, and was replaced by the 500 cc Ninja, and thus there were no more 908 engines to have two cylinders removed from, to turn it into a 454 engine.The Vulcan 500 was designed very similarly to the 454, with the basis again being from a Ninja counterpart, but the engine was taken straight from the 500 Ninja, and still de-tuned slightly compared to the 454 to give it more cruiser-like characteristics, with other changes such as a chain drive (implemented in later models), and no tachometer on the Vulcan 500 being implemented in the changeover, along with a bicycle spoke look for the wheels.