Europe is pretty much 4 stroke only for recreational use for that size new since iirc 2006. So its only 4 stroke models imported post to 2006 that are available now or s/h 2/4 stroke prior to that.
Equivalent engine now is 8/9.9hp 208cc twin 4-stroke that as far as i am aware can not be beefed up economically to 15hp as the 15/20hp 351cc is a much bigger engine approx double the weight of the old 9.9 2-stroke.
So new 2 stroke has not been an option since beginning 2007.
Please someone correct me if i am wrong as it would be nice at some point for me to be able to up the power of my 9.9hp Mariner.