The YSS fork upgrade kit contains a tighter fork spring as well as a fork valve and an adjustable fork leg lock. The fork valve changes the oil flow in the fork in both directions and the fork spring results in a tighter spring behavior. With the spar cover, the spring preload of the fork can be fine-tuned again: turning the adjusting screw increases the pressure and thus the preload of the fork spring. YSS delivers this kit vehicle-specific in the complete set. Attention: It is essential to observe the assembly instructions in the attached PDF