If you ride in the dirt, this is the book you need: the new Motocross & Off-Road Setup Guide. It's got 150 pages packed with information that lets you properly tune and setup your race bike to perform the way it should.
Written for the Average Joe Racer as an easy-to-use guide to tuning
Suspension tuning demystified
How to test and how to understand what the bike is telling you
Getting your bike to properly fit the most important rider in the world: YOU
What you need to understand about wheels, tires and brakes
The most bang for your performance buck
Understanding jetting and how to know what to do
Basic tips, fixes, solutions for race day problems