This is an example of a normal bike service gone horribly wrong. I did my normal after ride (after 2 rides) service including oil change and stainless steel filter cleaning. All good so far, but when I started the bike this morning for a nice desert ride, one of my riding buddies noticed fluid pouring out of the engine. The engine probably ran a total of 10-15 seconds max.. Anyways I shut her down and sure enough I had not torqued the oil filter bolts.. :D 'Idiot' I said to myself.. Well no riding on the YZ today. Later today I opened the drain bolt and the side oil channel. about 4-500 mls of oil remained and came out at that time. When it all finished draining I tightened everything up and put another liter of oil in. So I am hoping, no engine damage.. If the oil pumps out of the bottom then up to the head before going to the oil filter then I am thinking I should be OK because the engine would not have noticed a loss of oil. Unless the crank had a chance to dry up.. Any comments, what do you think? I have not fired her up again since turning it off this morning when I saw the oil leaking..