Here ya go http://www.yamahaownershandbook.com.au/?r=0
Yamaha didn't make a production 400 in 1997, but they did in 98 & 99.
After repeated failed attempts to download that particular file from the Aussie site, I don't think you'll succeed there, unless they fixed the problem. Unfortunately, the Euro alternative doesn't list one for the YZ400. You can try downloading one for a WR400 there, and another for the '00 YZ426, and kind of extrapolate the information you need from the two of them if indeed, you can't get the Aussie file to work.
I have the pdf on my home computer, PM me if you want me to post it somewhere and send you the link. Its for the 99 YZ400F, but that should be exactly what you are looking for.
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