SPARK PLUG INSPECTION

Specification

Plug Gap Inspection

Caution

• To avoid possible damage to the tip, do not adjust the plug gap.

• To prevent damaging the tip, use wire type plug gap gauge when inspecting the plug gap.

1. Measure the spark plug gap using the wire type plug gap gauge.

• If it is more than the maximum specification, replace the spark plug.

Standard plug gap

Z6: 1.0-1.1 mm {0.039-0.043 in}

LF: 1.25-1.35 mm {0.049-0.053 in}

Cleaning

Caution

• To avoid possible damage to the tip, do not use a wire brush to clean the plug.

Note

• To avoid possible damage to the tip, use gasoline to clean the spark plugs after removing dirt.

Visual inspection

1. Inspect the following items:

• If there is any malfunction, replace the spark plug.

- Insulator breakage

- Worn electrode

- Damaged gasket

- Badly burned insulator (sparking side)

Resistance Inspection

1. Measure the resistance of the spark plug using a tester as shown in the figure.

• If not within the specification, replace the spark plug.

Resistance

3.0-7.5 kilohms [25°C {77 °F}]