Spark Plug: Testing and Inspection

SPARK PLUG INSPECTION

Plug Gap Inspection

CAUTION:
- To avoid possib1e damage to the tip, do not adjust the plug gap.
- To prevent damage to the tip, use a 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
1.25 - 1.35 mm {0.049 - 0.053 in}

Cleaning

CAUTION:
- Carbon may adhere to the tip of the spark plug during vehicle delivery or repeated short distance driving during the winter time. If there is any malfunction such as rough idling or start difficulty due to carbon adhesion causing plug fouling, burn off the carbon by no-load racing the engine.
- When performing the no-load racing, apply the side brake and foot brake, move the shift lever to neutral (MTX), or the selector lever to the P position (ATX) to prevent serious injury.
- To avoid possible damage to the spark plug tip, do not use a wire brush for cleaning.

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

1. If there is carbon adhering to the spark plug, perform no-load racing at 3,000 rpm for 3 mm.

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 kOhms [25 °C {77 °F}]