I was going through my 2001 ZRX1200R and behind the timing cover I found a round gasket made of rubber just laying on the bottom of the timing cavity. Doesn't seem to affect anything but I'm dying of curiosity. Someone please tell me what it is and where it's from in engine.

 

Its the Gasket which sits between the Cam Cover and Cylinder head.

4 x 11009 in image below.

 

Thanks so much, you must be a mechanic or taken the engine apart. thanks

 

Glad to help.