On the 06 yzf 250, there is a window underneth the engine right by the shifter. It is ment for easy viewing to see if you have enough oil or not. But thats the hard part. There isn't any kind of "low" or "full" markings to check. It says in the manual that it should be up to the full level in the check window, but I dont see any "full" levels.I guess if the window is full, then its alright. But it doesn't seem right.