Hi. I posted a question on Yahoo answers a while back about taking my bike to Spain and asked about emmision control. Here's one reply I got. Not sure if it's a good advise, but ...

Hi
I'm thinking about moving part time to Spain and want to bring my BMW motorbike. does anyone know about emmission control on Spainish vehicles? How do i find out if my bike would comply. This bike was originally bought in Japan.

And the reply was:

Respect towards your good intentions. However, I suggest that you just drive that bike and don't care too much about emmission controls and the like. I know of numerous British expats that live in the country and that have never even thought about registering their vehicles. Even after 25 years they still drive them under their original number plates...