So, doing an oil change on the Pegaso. Check the manual Check amount of oil needed (2.5l) buy 3l of oil. Put bike on level surface and stick on stand. Warm engine. Unbolt drain plug. Remove 2l of oil (can you see where things are yet ?) Put in nearly 1 litre of oil (frame fill). Warm engine. Put in another 0.5 litre of oil. Warm engine. Check level.... full. Errr... ok, WTF is going on ???? Answers on a postcard please. (Note, same engine as Yam XT 660)