...don't take everything as gospel. This isn't to say Mr. Cocco doesn't know what he's talking about, as he obviously does - he just sometimes doesn't make things very clear when he's using English as opposed to Italian. Some of it is rough translation, while some of it is just shoddy editing. In particular, I think whoever edited it didn't do much math or engineering. Some of the equations themselves have typos (an explaination of an equation describes two different variables when only one exists in the equation... but twice), many of the variables aren't explained, and some equations just don't make sense (a force divided by a distance equals another force). And the chapter on aerodynamics needs to be reworked - there are a few times when downforce and lift are used interchangeably even though they're opposing each other, and since those are the key points in the chapter it makes the rest of it harder to follow.
That being said, if you just take this as basic theory and don't try to build any mathematical models or anything off it, it's an excellent source of info. Mr. Cocco is one of the best in the field and does a good job of getting fairly specific in a relatively short book. The illustrations are great in demonstrating ideas that are hard to visualize just based on his writing, and the equations, if not completely accurate/explained, give a good basic idea of how the stuff is looked at analytically. It's also nice to have a book dedicated just to describing the dynamics and forces involved. So if you're looking for anything regarding engine tuning, look elsewhere. The extent to which engines are involved here are their affects on weight transfer, CG height, etc...
If you're looking for the most difinitive and thorough explaination of the subject, get "Motorcycle Dynamics" by Vittore Cossalter. Mr. Cocco did cite Mr. Cossalter as his main scientific source, after all. But if you'd just like to get a general "so that's why that happens" idea of all the little things your bike does, this is the book for you.