hi there should be 2 bolts athe bak of the crank case one half way down and one at the bottom,you might find it a bit easyer to pick the back end up a bit when filling,you need to put the oil in the one half way down undo the bottom slightly and when you see a dribble come out do it up again(only put the recomended amount in ,Ok! hope this helps as i had to mine a while ago
J P
February 2007