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there are various different parts of the bike that "break-in". brakes for example are one item that take about 100 miles until they are really fully bedded in. when talking about the engine itself, what is breaking in is; each cylinder is honed with a cross hatch pattern that effectively makes the cylinder one big file. as the engine breaks in, the cross hatch file pattern scrapes away part of the piston rings. the piston rings and cylinder wall eventually smooth out from running, and after they are smooth, the cylinders will take full compression. what most people seem to miss is that 95% of this occurs in the first 15 or 20 minutes of the engine running. the bike is ran for a minimum 2-3 miles at the kawasaki factory. which means the engine is already almost entirely broken in by the factory. after that its only relatively minor things breaking in like brakes and clutch
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