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I doubt a two-stroke would ever meet even mid-70s emissions standards.
The two-stroke's big edge is it lack of a valve train. But that means port induction/exhaust. So a port uncovers with the combustion event still going on. Unburned hydrocarbons (VOC) are emitted.
A lot of smart cookies tried to save the two-stroker but the last of them died out before Jimmy Carter was out of office.
Like everything else, engineering has a history.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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