I recently purchased a 2010 ktm 450 six days edition. The regular version of this bike came with a green sticker, but mine came with a red. The vin sticker says "competition only" but the vin numbers indicate it should be green. The DMV was willing to do more research but it would come down to the visual inspection, so I didn't follow through with it.
In my research, I found out that you can get a plate for a green sticker bike. It must have working lights and signals and be equipped with a speedo if the bike originally had a speedo. After proper inspections, the bike will be dual registered with a plate and a green sticker. I rode with a guy that has done 2 this way, and was riding a crf 450x that was plated and compliant.
More info can be has here http://www.bajadesigns.com/docs/tech...ion_packet.pdf
A bike can also be registered as a special construction, but I have been told that California only allows 1 per person per lifetime.