Johnson 4HP
 

I have bought a boat with a Johnson 4HP outboard as a reserve. I know this
sounds silly but how does the cowling come off. There is a stainless screw
front and back to release the lower half but what about the top. There is a
large phillips screw in the top of the cowling but I didn't want to loosen
that until I was sure. I can't find a number to quote and presume this is
under the cowling?
Thanks