I just bought a 1998 YZ400f bike runs great. Had to change oil in it so I drained the oil already in it no problem. Put oil filler plug back in. But where do you add the oil back into it? I see the hole for the dipstick at the top of the bike by the handlebars but that cant be where it goes. I looked in the online manual but the picture was dark and I could not tell where they added the oil. Any help would be great I want to ride it as soon as I find where the oil goes.