Service Manual — page 56 of 715

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2-34 PERIODIC MAINTENANCE
Periodic Maintenance Procedures
                           NOTICE
    Be sure to remeasure the clearance after selecting
    a shim according to the table. If the clearance is out
    of the specified range, use the additional shim.
○If there is no valve clearance, use a shim that is a few
    sizes smaller, and remeasure the valve clearance.
•   When installing the shim, face the marked side toward the
    valve lifter. At this time, apply engine oil to the shim or
    the valve lifter to keep the shim in place during camshaft
    installation.
                           NOTICE
    Do not put shim stock under the shim. This may
    cause the shim to pop out at high rpm, causing ex-
    tensive engine damage.
    Do not grind the shim. This may cause it to fracture,
    causing extensive engine damage.

• Apply
  lifter.
          engine oil to the valve lifter surface and install the

• Install the camshafts (see Camshaft Installation in the En-
  gine Top End chapter).
• Recheck    the valve clearance and readjust if necessary.
• Install the removed parts (see appropriate chapters).
Air Suction System Damage Inspection
• Remove:
   Right Side Cover (see Side Cover Removal in the Frame
     chapter)
•   Disconnect:
     Subthrottle Sensor Connector [A]
     Air Switching Valve Hose [B]

• Connect   the subthrottle sensor connector.
• Plug the air
  Start the engine and run it at idle speed.
• and feel vacuum
               switching valve hose end [A] with your finger
                    pulsing in the hose.
    If there is no vacuum pulsation, check the hose line for
    leak. If there is no leak, check the air switching valve
    (see Air Switching Valve Unit Test in the Electrical Sys-
    tem chapter) or air suction valve (see Air Suction Valve
    Inspection in the Engine Top End chapter).