3RB-012812 is not a frame number for a 250 Yamaha dirt bike; it's a motor number. To find out the model year and frame, you need the frame number.
1994
I had one thats serial number was 300007, and it was a 1983.
Yes, if you have the frame number (and the bike is original) phone your Honda parts dealer and he can tell you the model and year of manufacture.
on your main frame in between your a -arm and the frame on your left side when your sitting on the bike the frame number is there and on ur left side on the engine case there is a permenet tag with your engine number on it
phone your Honda dealer with the frame number (right hand side of bike if sat on,headstock part of frame) they will tell you the year.
I have a Yamaha 80cc with frame number and matching engine number: G3 116632. I believe this is a european bike because the spedo is in Klm,s and the year is 1964
i think 1992
Look at the frame for a sticker that will say the year OR find the VIN number stamped on the neck of the bike frame - it is 17 digits. One of the letters (not a number) in the VIN is the YEAR CODE. look up on net for a VIN DECODER and run the VIN. it will tell you the year OR bring VIN into a Yamaha dealer they will tell you
There is usually a transfer on the frame saying what model it is
== == Most motorcycles have the VIN stamped into the front forks or front frame. The serial number contains a year of manufacture code. Call a dealer, tell them the serial number and they'll tell you the year.
get the vin number off the frame under the handle bars. Then go to kawasaki.com and look underparts diagram. there you can enter the vin number and voila...all info on the bike.