Registration is required to view the Valving Logic web site.  Registration is free.     Register The valvinglogic site contains suspension related information as well as stock and modified valve stacks for dirt bikes. The site is set up in three levels. Level 1 - free:  View stock valve stacks along with basic valving information. Level 2:  Purchase modified valve stacks.  We will provide the valving configurations along with the basic info needed to get a bike set up properly. Level 4:  For a one time fee, tuners have access to everything.