Anyone know where to get a free manual for yamaha sr 400

You can download the manual for yamaha SR400 from link below.but as the company release the manual in japanese language only.you will have to get it translated from some online source into your desired language:---
http://www.yamaha-motor.jp/mc/lineup/sportsbike/sr400/manual/pdf/sr400.pdf
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Easiest way is to go to
http://www.omegaracer.com/manuals.html

It's a website dedicated to the SR. You'll find lots of manuals and resources there to download for free.
They also have great custom parts.