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' two-stroke engines '
Two-stroke engines were banned in the United States, starting around 1991.
Orbital Engine's 2-stroke, of much interest in the automotive industry, was finally abandoned, after unsuccessful attempts to bring them into compliance for tailpipe emissions.
Today, in the United States, the only 2-strokes allowed to be sold, are under 50cc in displacement, and mostly for powered yard-care products and chainsaws.
They're 'filthy' and will be superannuated by electric replacements.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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