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Valve Clearance Adjustment

NOTE: Valves should be adjusted 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 "UP" mark (A) on the camshaft sprocket should be at the top, and the TDC grooves (B) on the camshaft sprocket should line up with the top edge of the head.
    3. Fig 1: Identifying Mark On Camshaft Sprocket And TDC Grooves
    G05454161Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Select the correct thickness feeler gauge for the valves you're going to check.

    Intake: 0.15-0.19 mm (0.006-0.007 in.) 

    Exhaust: 0.26-0.30 mm (0.010-0.012 in.) 

    EXHAUST 

    Fig 2: Locating Valve Adjusting Screw
    G05454162Courtesy of AMERICAN HONDA MOTOR CO., INC.

    INTAKE 

  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
    G05454163Courtesy 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: Locknut And Adjusting Screw With Torque Specification
    G05454164Courtesy of AMERICAN HONDA MOTOR CO., INC.
  6. Tighten the locknut and recheck the clearance. Repeat the adjustment if necessary.
  7. Rotate the crankshaft clockwise. Align the No. 3 piston TDC groove (A) on the camshaft sprocket with the top edge of the head.
    Fig 5: Aligning TDC Groove With Top Edge
    G05454165Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Check and if necessary, adjust the valve clearance on No. 3 cylinder.
  9. Rotate the crankshaft clockwise. Align the No. 4 piston TDC groove (A) on the camshaft sprocket with the top edge of the head.
    Fig 6: Aligning TDC Groove With Top Edge
    G05454166Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check and if necessary, adjust the valve clearance on No. 4 cylinder.
  11. Rotate the crankshaft clockwise. Align the No. 2 piston TDC groove (A) on the camshaft sprocket with the top edge of the head.
    Fig 7: Aligning TDC Groove With Top Edge
    G05454167Courtesy 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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