how do i take off the engine casing?

what do you mean by 'casing' ? Is it the big<br> plastic thing attached on the top of engine?<br> If so, detaching it is just a blitz:<br> <br> pull up gently - first front, then rear.<br> reinstall in opposite order, paying attention<br> that two rubber mounts click in place - front<br> end of the engine, and on the rear - air<br> cleaner pipe has to fit its rubber grommet.<br> BTW it is very tricky to do on a hot engine.<br>