Manual - Chapter 5 - Fuel & Oil

12: Pressure regulator: Removal/Examination/Refitting

Note: Before starting work on any part of the fuel system, read the notes given in Section 2 of this Chapter concerning safety precautions.

  1. On K100 RS, K100 RT and K100 LT models, remove the fairing knee pads, lower side panels and radiator cover. On K75 S models owners may wish to remove the fairing side panels or at least their bottom covers to gain easier working conditions. On all other models, remove the radiator cover panels. See Chapter 7 - Frame & Forks.
  2. Remove the complete air filter assembly. See Section 14 of this Chapter. Relieve any residual fuel system pressure. See Section 3.
  3. Using a suitable screwdriver to slacken the hose clamps (where fitted) disconnect the fuel rail/pressure regulator hose, the fuel return hose, and the vacuum hose.
  4. Slacken the nut securing the regulator top to its mounting and withdraw the regulator.
  5. On refitting, tighten the nut securely, to the specified torque setting, where available. Connect the fuel return hose (from the tank) to the top union, the fuel rail hose to the side union and the vacuum hose (from the rear throttle body vacuum take off-stub) to the bottom union.
  6. Secure the pressure hoses by pushing them fully on to the regulator stubs and sliding each clamp down until it is behind the stub flared end, then tighten the clamp securely. Check carefully for leaks when the engine is started.
  7. Examine the regulator carefully; if it is cracked, dented or damaged in any way, it must be renewed. Connect the vacuum hose to the bottom union and suck on the hose end; if there is any sign of leakage, check the hose for splits, tears or damage and renew it if necessary. If the hose is in good condition, the regulator diaphragm must be damaged; if this is the case the regulator must be renewed.

12.3 Pressure regulator is mounted on right-hand side of throttle butterfly assembly