Engine knocking noise at 4000-4500 RPM only Fazer 600

[fazersharp]

Hahaha of course not, the engine is off.
I also did that, no stiff link.


do I need to drain the oil before opening the clutch cover if the bike is on its side stand?


I also think there is excess oil in the bike. the window is completely full.

Checking for stiff links. use the bottom run under the swing arm and one by one grab one and hold it still and then see if the connecting one can bend up and down freely. I had the exact problem and could feel it through the left peg which was caused by a stiff link but it still happened when rolling/ coasting so it does not sound like your issue. 

The full oil window could just be very slightly over which is not a problem. The only way to tell is to get someone to sit on the bike and gently tip it over so you can judge how too filled it is. Or get a syringe and a tube stick it in the filler cap and draw some out- let it settle and see where you are at.