a proper thicko question,

I think I have a CBR1000RR engine, cant find the oil fill window anywhere, any help or better still photos would be a great help thanks.

No photos but I could tell you the best place to look for it.
It will be on the side of your crank grear box case. Assuming you have a se7en style car you will have to look from the front of the car looking back ( thats what its like on a GSXR) . This is becasue the engine sits side ways. The exausts are at the front of a bike, gearbox towards the back. I know this may seem obvious but ill give you all of the info I can think of as your having a thicko moment!!

It will be about the size of a 1p coin. If you have never seen it then it will be covered in grim so give it a clean. Use a torch to shine at it even during the day. It helps.

The best way to look for it is either from underneath or by removing the front cone.

Hope that helps.

If you look at it, if it were in the bike, then it should be relatively obvious for most bike engines - having said that, I don't know whether that engine has a sight glass - have you removed the oil fill plug to see if it has a dipstick? (just in case)

Before you fill it, mind you’ll have to have the engine sitting at the same angle as it was in the bike to get a correct reading. Your best to buy a manual for that bike anyway.