Honda

http://www.honda-engines.com/

http://www.hondapowerequipment.com/why.htm

Briggs & Stratton

http://www.briggsandstratton.com/mainsite.asp?lrid=1

Kawasaki

http://www.kawasaki.com/index.html

http://www.kawasaki.com/kengine/index.html

Lawnboy

http://www.lawnboy.com/

http://www.lawnboy.com/mowers/mowers.htm

Onan

http://www.onan.com/na/pages/en/products/powergeneration/onanengines/index.cfm

Tecumseh

http://www.tecumseh.com/engines.htm

Homelite

http://www.homelite.com/Homelite/default.asp

Ryobi

http://www.ryobi.com/indexryobi.html

Lawn Servicing Manufacturers- a long list of Manufacturers

http://www.lawnservicing.com/opemanufactures.htm