Where can you get an owners manual for a 1978 Honda CB 400 T2?

There are websites that offer most motorcycle manuals for download on the internet. But you have to pay for them, using a credit or a debet card. Another possibility is to ask at a large Honda motorcycle dealership. They may be able to get you a copy, especially if it is an older company that has been long in the buisness, then they may have a copy. You can also, and finally, try and contact the Honda Motor Co. for the service manual, which is more detailed than the owner's manual but quite as good.