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Valve Clearance Adjustment

NOTE: Adjust the valves only when the cylinder head temperature is less than 100 °F (38 °C).
  1. Remove the cylinder head cover (see CYLINDER HEAD COVER REMOVAL  ).
  2. Set the No. 1 piston at top dead center (TDC). The TDC marks (A) on the cam chain sprocket should align with the cylinder head surface.
    Fig 1: Aligning TDC Marks On Cam Chain Sprocket With Cylinder Head Surface
    G03692263Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Select the correct thickness feeler gauge for the valves you're going to check.

    Intake: 0.21-0.25 mm (0.008-0.010 in.) 

    Exhaust: 0.25-0.29 mm (0.010-0.011 in.) 

    Adjusting screw location: 

    Fig 2: Identifying Intake And Exhaust Valves
    G03692264Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Insert the feeler gauge (A) between the adjusting screw and the end of the valve stem and slide it back and forth; you should feel a slight amount of drag.
    Fig 3: Inserting Feeler Gauge Between Adjusting Screw And End Of Valve Stem
    G03692265Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. If you feel too much or too little drag, loosen the locknut (A), and turn the adjusting screw (B) until the drag on the feeler gauge is correct.
    Fig 4: Loosening Locknut With Torque Specifications
    G03692266Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Tighten the locknut and recheck the clearance. Repeat the adjustment, if necessary.
  7. Rotate the crankshaft 180 ° clockwise (camshaft gears turn 90 °)
    Fig 5: Rotating Crankshaft 180 ° Clockwise (Camshaft Gears Turn 90 °) (1 Of 3)
    G03692267Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Check and, if necessary, adjust the valve clearance on No. 3 cylinder.
  9. Rotate the crankshaft 180 ° clockwise (camshaft gears turn 90°)
    Fig 6: Rotating Crankshaft 180 ° Clockwise (Camshaft Gears Turn 90 °) (2 Of 3)
    G03692268Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check and, if necessary, adjust the valve clearance on No. 4 cylinder.
  11. Rotate the crankshaft 180 ° clockwise (camshaft gears turn 90°)
    Fig 7: Rotating Crankshaft 180 ° Clockwise (Camshaft Gears Turn 90 °) (3 Of 3)
    G03692269Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. Check and, if necessary, adjust the valve clearance on No. 2 cylinder.
  13. Install the cylinder head cover (see CYLINDER HEAD COVER INSTALLATION  ).
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