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Ride JBI

KYB PSF Pneumatic Spring Fork Technical Guide

KYB PSF Fork Technical Guide

Updated 5/25/13

KYB PSF Fork Specs

  • Pressurized air replaces main spring and pressure spring therefore decreasing weight and friction
    • A change of 2 PSI is similar to 1 spring rate change such as .44kg/mm to .45kg/mm
    • Target weight range is 170-190lbs
    • Balance spring is 3.2N (Other rates to be available for riders outside target weight range)
  • Midvalve piston diameter increased to 32mm (same diameter as compression piston)
    • Midvalve piston is old KYB two port and two piece design
    • Midvalve has large bleed holes and float amount
  • Larger diameter bottoming cone for improved bottoming control
  • 2 pounds lighter than previous spring forks
  • 2013 Honda CRF450 & Kawasaki KX450F Individual Specs coming soon


KYB PSF Fork Tips
  • Quality forks seals are now more important than before (OEM or SKF)
    • Do not use the "09" KYB spec fork seal that does not have spring around outer seal lip
  • Check air pressure before each ride (Especially during temperature changes)
  • Do NOT use digital pressure gauges
  • Outer chamber fork oil quantity can be adjusted to alter fork progressiveness
KYB PSF Fork Parts

SDI Elite KYB PSF Mid Valve Piston KYB PSF SKF Fork Seals MXT PSF Huck Valve
SDI ELITE PSF MV Piston     SKF PSF Fork Seals                MXT PSF Huck Valve
KYB PSF Fork Tools

drc psf shock pump

KYB PSF Fork Videos


KYB PSF Fork Pictures



KYB PSF Fork Cap.png