Necessity, the mother of invention

From http://englishrussia.com/ and http://thenewcaferacersociety.blogspot.com/

For a gallery of the homemade snow machines: http://englishrussia.com/index.php/2010/04/14/russian-homemade-snowmobiles/#more-12333

Kustoms of the 50's and 60's

see also: http://justacarguy.blogspot.com/2008/07/variety-of-bikes.html

http://www.jalopyjournal.com/forum/showthread.php?t=320843