Called DMV and spoke to a supposed "expert" on registering "dirt bike" for street use in CA and here's where they stand (not much change, but at least I got it from the horses ass:) For out of state vehicles 1982 or newer, over 50cc, 7500 miles or more, has a US Emmissions sticker "FOR HWY USE" (CA sticker not necessary) - this may be reg'd in CA for hwy use. If you don't have 7500 miles on the bike, it HAS to have a CA sticker or just forget about getting it plated legitimately. If it's a CA reg'd green sticker bike without a CA emmissions sticker you wont get it plated legally. And if you manage to due to an error by an unknowing DMV employee (and you've got a pretty good chance of that happening - after all we're talking DMV employees - no offense intended) CARB has been vigilantly forcing the DMV to rescind those plates. If it's CA plated and was done so after 1/31/04 and does NOT have a CA sticker, CARB may send you a love letter one day and if you're buying such a bike, you may be rejected at the DMV for plating when you go to change title to your name. Some of the above is internal and is apparently not available to the public - YOUR tax dollars hard at work against you. Good luck!!!