CHECKING THE SPARK PLUGS
The following procedure applies to all of the spark plugs.

1. Remove:
    • Rear cylinder right cover

2. Disconnect:
    • Spark plug cap

3. Remove:
    • Spark plug
Before removing the spark plugs, blow away any dirt accumulated in the spark plug wells with compressed air to prevent it from falling into the cylinders.
4. Check:
    • Spark plug type

       If incorrect -> Change.
Manufacturer / Model
     NGK / CPR7EA-9
5. Check:
    • Electrode

       If damaged/worn -> Replace the spark plug.

    • Insulator

      If Color is Abnormal -> Replace the spark plug.

      Normal color is medium-to-light tan.

6. Clean:
    • Spark plug (with a spark plug cleaner or wire brush)

7. Measure:
    • Spark plug gap "a" (with a wire thickness gauge)

      If out of specification -> Regap.
Spark plug gap
     0.8-0.9 mm (0.031-0.035 in)
8. Install:
    • Spark plug
Spark plug
     13 Nm (1.3 m-kgf, 9.4 ft-lbf)
Before installing the spark plug, clean the spark plug and gasket surface.

9. Connect:
    • Spark plug cap

10.lnstall:
    • Rear cylinder right cover

CHECKING THE IGNITION SPARK GAP

1. Check:
    • Ignition spark gap

      If out of specification -> Perform the ignition system troubleshooting.
Minimum ignition spark gap
     6.0 mm (0.24 in)
If the ignition spark gap is within specification, the ignition system circuit is operating normally.

      a. Disconnect the spark plug cap from the spark plug.
      b. Connect the ignition checker "1" as shown.
Ignition checker
     90890-06754

Oppama pet-4000 spark checker
     YM-34487
      2. Spark plug cap

      c. Turn the main switch to "ON" and set the engine stop switch to "RUN".
      d. Measure the ignition spark gap "a".
      e. Crank the engine by pushing the start switch and gradually increase the spark gap until a misfire
          occurs.
CHECKING THE SPARK PLUG CAPS
The following procedure applies to all of the spark plug caps.

1. Check:
    • Spark plug cap resistance

      If out of specification -> Replace.
Resistance
     7.5 - 12.5 Kohms
      a. Remove the spark plug cap from the spark plug lead.
      b. Connect the pocket tester (ohms  x 1 k) to the spark plug cap as shown.
Pocket tester
     90890-03112

Analog pocket tester
     YU-03112-C
      c. Measure the spark plug cap resistance.
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