The owners manual is not very long and has a ton of good information. I have not read it cover to cover but I do know what is in it. tire pressure,how to change the oil, clutch cable adjustment. I have referenced it often.
The service manual is just that and is quite large. More indepth and techincal.
When someone posts asking what the tire pressure should be or how to check the oil window and If they have a new bike I am pretty sure they haven't even cracked it open. It would be quicker for them to read that then post a question. The DIY's in the forum are awesome also
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I recommend to be like Sunny and Know what is in that little book!!