Help Identify Mercury outboard 50 2007 4 or 2 stroke

[slavik19]

is this a 2 stroke or 4 stroke? carburated or no thanks in advance
pic link: http://img.copartimages.com/website/data/pix/20150811/30028835_07X.JPG
http://img.copartimages.com/website/data/pix/20150811/30028835_03X.JPG