One thing I would do on quads is to run a string around the side of rear tires up to the front, making sure the front and back of the front tire are touching the string the same amount, sometimes easier if the back is a bit wider, you can just measure the space from string to tire on the front part and rear part of front tire,,,if that makes any sense?? Oh make sure steering wheel is dead on straight, also you may want to tow-in just a fuzz, but not much. sometimes helps with handling. I'm sure someone will chime in some info as well. This is just what has worked for me in the past