The Valkyrie service manual is around $50, which is a lot of money.
But I have to admit that it is well worth the price and it is fascinating to read.
I wish they had a PDF version that I could put on my iPad but I suppose that would lead to people giving the PDF away. I can't picture anyone scanning in a whole book, but I have seen a CBR1000RR service manual that was scanned from the book. (It was a big file!)
Anyways, most of the book has stuff you (hopefully) will never need, but the sections on wiring locations and routing, maintenance tasks and stuff like that are really helpful. The maintenance section goes into a lot
more detail than the owner's manual.
If you have a very specific question about something from the service manual I am willing to look it up for you, but I have no intention of doing a lot of work or "stealing" from the people who make the manual.
An example might be:
Question: What is the alternator output?
Answer: 1.2kW at 5000RPM
(That's 1200 watts! And with all of the lights being LED, there is a lot of room for electrical accessories. Basically it is the same alternator that a Gold Wing has.)