Does your bike have Mag wheels? There were 2 models of the 400 special. The XS400H had spoked wheels and the XS400SH had Mag Wheels. Both were 400 specials. I have a XS400H, if you like I\´d send you a picture to compare to yours. Mine came with a manual but I haven\´t a clue other than Yamaha as to where to get one. 
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