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CARBURETOR - Idle Mixture Adjusting Procedure (Models with catalyzer)

EF & EC-159prose procedure

Idle Mixture Adjusting Procedure (Models with catalyzer)

Idle Mixture Adjusting Procedure

  1. 1
    Remove carburetor from engine.
  2. 2
    Carefully drill idle adjusting screw seal plug and remove it from plug hole with suitable tool.
    Be careful to prevent metal chips from entering carburetor, and be sure that sliding surface of link and shaft are not scratched.
    When drilling seal plug, be careful not to damage head of idle adjusting screw.
    Diagram showing the throttle chamber with a drill removing the seal plug from the idle adjusting screw bore. A downward arrow indicates the drilling direction; labels: Throttle chamber, Seal plug, Drill.
    SEF212A
  3. 3
    After performing step 2, mount carburetor on engine.
  4. 4
    Start engine, adjust idle RPM and adjust idle "CO"% by turning idle adjusting screw.
  5. 5
    If proper idle "CO"% is not obtained by adjustment, turn off engine and overhaul carburetor or replace it with a new one. Then adjust idle "CO"% by turning idle adjusting screw.
  6. 6
    After adjusting carburetor idle-rpm and mixture ratio, turn off engine and install new seal plug on carburetor.
    Diagram showing the throttle chamber with a new seal plug being pushed with proper tool over the idle adjusting screw bore. Labels: Throttle chamber, New seal plug, Idle adjusting screw, Push with proper tool.
    SEF213A
  7. 7
    Finally, check idle "CO"% again. If idle "CO"% is abnormal, readjust it by starting from step 4.
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