This 500cc Kawasaki engine is built the old way: Everything is lying in an open clamshell—crankshaft, gearbox, input shaft, output shaft. Behind all that is the kickstarter shaft. Lining everything up in a single plane makes the engine very easy to assemble, but it also makes for a long engine. With a long engine, it is harder to concentrate more mass of the engine forward to increase the rate at which you can accelerate on the motorcycle before the front end lifts. If you keep on opening the throttle after the front end lifts, it lifts higher, and the higher it goes, the easier it is to lift it more, until finally you are standing at the parts window ordering another taillight lens because you have wheelied over backward.