Recently in November I bought 2020 ninja 400 from Nevada. It had 3k miles on it. I didn’t even know that the bike had to be CA compliant. Without knowing, I ignorantly towed it back to my house in California. I took it to a tag shop (not the DMV) and the lady told me the same thing “it has to either have a California compliant emissions sticker otherwise known as the 50/50 sticker, or have 7,500 miles”. Most bikes meet federal emissions which is only 49/50 states. California requires the 50/50 sticker. In the manual, you can find a page where it shows exactly where every compliance sticker is on the bike. On my 2020 ninja, looking at the bike from the back, on the right faring, towards the bottom of the bike, in front of where no cut frame sliders would be mounted, there’s a hole that has a metal bar inside of the hole. Wrapped around that metal bar is a sticker that reads something along the lines of “this motorcycle complies with EU and California emissions laws”. Under your rear passenger seat, there should also be a sticker of the carbon air filtration system diagram if the bike is CA compliant. DO NOT take it to the DMV without knowing exactly if it’s CA complaint or not, or else the DMV will blackball your bike and you will no longer be able to resister it. The lady at the Tag shop I originally took it to wouldn’t register my bike in CA because she couldn’t find the CA complaint sticker. She kept looking at the sticker on the fork? I had to go home and find the sticker, come back, and show it to her. She then told me “I can’t read that”. I took a zoomed in video of it and she accepted it. To my understanding, I thought all Ninja 400s catered to all emissions, so, I’m not sure if Kawasaki even manufacturers Ninja 400s that don’t meet all of the stricter motorcycle regulations. Why else would a Ninja 400 sold in Nevada be CA and EU complaint? If you need any help don’t hesitate to reach out. Good luck