[TYEster]

Originally Posted by OTB

http://www.bikersrights.com/ama/EPA_end2strokes.html

http://cfpub.epa.gov/ordpubs/nerlpub...cfm?deid=66311

http://dirtbike.off-road.com/dirtbik....jsp?id=266817

Great... But history and the change of motors was already being made.

http://www.motorcyclemuseum.org/clas...ike.asp?id=132

http://www.motorcyclemuseum.org/exhi...ple.asp?id=377