It was an interesting situation when Tecumseh closed, then disposed of, their engine plant and assets. Early in 2009 "certain assets" of Tecumseh Power were sold to Certified Parts Corporation, the owner of which announced a succession of ambitious plans. Here is the Wikipedia entry:
http://en.wikipedia.org/wiki/Tecumseh_Products

Here is the first announcement:
http://www.tecumsehpower.com/comet/index.html

Here is one a year or so later:
http://www.manufacturing.net/news/2010/09/certified-parts-corp-determined-to-stay-afloat

It seems the facilities to make Tecumseh spares may still exist, and there may also be substantial stocks of some spare parts.