Small Engines (Lawn Mowers, etc.): Connecting two small engines, centrifugal clutches, small engines

Question
  I want to mount two engines on my custom made mower frame.  I have two B&S 5.5hp engines.  Can I tear them down and connect them with some custom made parts?  Like you would see on the large tractors at a tractor pull.  Any guidance would be great.

Answer
Hiya Seth
WHOA!  Man now THATS a project!  As for connecting, can't be done internally, they'll have be be externally connected.  Best method is have them both facing front to back, with a mainshaft running parallel to each, OR, have them side by side(slightly staggered)driving a mainshaft between them.  Problem 1, they'll need to retain centrifugal clutches to isolate them from one another (you'll never get 'em cranked otherwise).  Email me at [email protected]  and tell me what you've got.
CYA