The YSS Fork Upgrade Kit includes a tighter fork spring, fork valve and adjustable fork bolt lock. The fork valve changes the oil flow in the fork in both directions and the fork spring causes a firmer spring behavior. With the handlebar 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 throughout the set. Attention: Please note the installation instructions in the attached PDF