The green sticker doesn't matter one way or the other. It's not the federal emission sticker to make the bike able to be plated in California. There is a federal emission sticker on 50 state bikes stating that they meet the requirements for street legal use in all 50 states, no WR450 will have it. My friend John called DMV HQ and talked to the main guy that interprets their regs, a previously green stickered bike is not a disqualification for the " loophole " that we use to get a plated bike with more than 7500 miles from out of state transferred into California, as long as it " left " the state and came back in the regs apply. The 7500 mile loophole was written so folks couldn't buy a new vehicle from out of state to avoid state taxes on the purchase, when it was written there was still 49 state cars and California compliant vehicles. At the time the regs were written California had just lost a court case where they were charging owners of 49 state cars more money on their registrations and renewals because they polluted more ( lol ), they had to give the excess money back to the people, so when the new regs were written they included a clause for 49 state vehicles and that is the one we use to transfer a bike into California. The law states ( regs ) Street legal and registered in another state AND more than 7500 miles on the odometer an emission compliance sticker is not required.
That being said, you may run into a DMV jackwad who doesn't know the law and denies you because he wants to see the sticker, don't throw a big fit or get argumentative ( you are dealing with a government monkey, they don't &%$#@!ing care ) just go to a different DMV.
Ok, I really appreciate all the info. I think I might go ahead and try this once I think i'm ready.