The new R1250RS are showing up in showrooms .... in the UK

[Grumpy Goat]

Do they have to do a separate EPA certification for each bike model? Or is the same engine in all the boxers make for just one submission?

Probably not unless there is money involved and the government just wants to get revenue from unnecessary certification.

Best case scenario is that every importing country checks their environmental requirements and if the vehicle is certified by a recognized authority to a higher standard then no additional certification is needed. On the other hand if their standard is higher (or different) then certification might be required.

That would be my guess.