Well, I wasn't aware of it being copyright material. All I did was google KLR650 service manual pdf and it all came up. Had a free download . Even if you do not download it it is all there to read so if only read and not copied, no harm no foul. Right?
Copyright law is fairly straightforward. Kawasaki writes a manual, copyrights it*, and offers it for sale. Anyone who takes that copyright material and reproduces it is violating the copyright. Anyone who makes it available without creating a sale for Kawasaki is violating copyright. Of course, once you have bought a copy in the format that it was originally offered for sale (paper, in this case) you may give that copy away, loan it, or re-sell it. You may not make copies of it and give them away or sell them.
In this case, the owner of the website that is collecting the material and offering it as a free download is clearly violating copyright law.
Whether you are violating copyright by reading copyrighted material made available by a third party is a bit fuzzy. If you do it make use of the information and to avoid purchasing a copy, then it's a violation. If you should happen to see something incidentally in the course of reading the forum's 'Latest Posts' (for example, if I were to reproduce a page containing exploded diagrams and torque values) you would not be in violation (but I would).
There are cases known as "Fair Use" where copyrighted material may be displayed and reproduced, but that's another topic.
The forum places itself in jeopardy as an accessory if it allows copyrighted material and links to copyrighted material to be displayed.
Would it ever come to anything? Probably not but we have to err on the side of caution. The music industry defends its copyrights very aggressively. The vehicle industry, not hardly. Haynes and Clymer, maybe a bit more.
No harm done. Now you know.
*one really does not have to expressly copyright material. Proving you were the originator is sufficient to have copyrights.