Better idea.

Since MDS engines are no more, and parts availability is limited to what is left on the shelf at various shops and distributors, get rid of the engine and get another of the same size from a better established, and higher quality manufacturer.

Some suggestions are: Tower (cheap engine), OS (usually good engine), Irvine (excellent engine), Thunder Tiger (good engine), Magnum (a so-so engine), SuperTigre (excellent engine), and a couple of others.