2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 116Get this manual
ADJUSTING THE FRONT SHOCK ABSORBERS
Steering nut wrench PNYU-33975, 90890-01443 Locknut 30 Nm (3.0 kg, 22 ft lb)
NOTE: Always tighten the locknut against the adjusting ring, then torque it to specificationLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
2Adjust: rebound damping force aTurn the adjusting screw in direction or bMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM