Those motorcycles both have EPA certificates for Off Road use, seems that there are allot of states that do not check or care about the federal regulations? They likely just check the VIN on the bike against the VIN on the MSO, they typically have a list of documents, proof of personal identification and a form to fill out, most are more interested in the taxes than anything else.
Insurance companies do not check either.
The bikes all have horns, turn signals and proper lights. Their emissions are probably not remarkably different then the certified street legal versions.
That does not mean that you can always get them registered with a street plate. If they say NO you have an off road only vehicle.
Some states may allow conversions of off-road to street bikes, they check for a horn turn signal headlight…
http://www.motosport.com/blog/how-to...e-street-legal
the article simply choses to ignore emission limits, there are two categories off and on highway.
Manufactures apply a decal to the frame typically, it states the vehicle meets or exceeds the FMVSS. There are other things they need to do, to meet the NHSTA administrations regulations none seem that arduous or expensive to abide by. Others are meeting the regulations.
The emissions are just a different track, why send what is obviously a dual sport through OFF road only? Add some cheap emissions controls and tune them to the limits, many of the people just remove the controls and tune the bikes however some do not bother.
Somebody is going to get stuck with a street bike they cannot ride on the road, that is not nice is it!
If that happens it seem that Vermont may be willing to offer a work around?