Engine sounding a little rattly

[His Dudeness]

The engine oil will go black after a couple of hundred miles. It's just carbon from the combustion process. The top end rattle is probably just the cam chain. There's an automa'tic cam chain tensioner on the fazer and the cam chain can get a bit rattly between adjustments. There's most likely nothing wrong but if you're worried you could let a mechanic listen to it.