Inspection of Spark Plug Inspection and clean 3. Check the spark plug as below. 1) Insulator broken 2) Terminal worn 3) Carbon deposit 4) Gasket damaged or broken 5) Porcelain insulator of spark plug clearance 4. Check the plug clearance using a plug clearance gauge and if the value is not within the specified values, adjust it by bending the ground clearance. When installing a new sparkplug, install it after checking the uniform plug clearance. 1 1) Ignition cable 1. Disconnect the ignition cables from spark plugs. 2. Remove all spark plugs from the cylinder head using a sparkplug wrench. Take care not to come foreign materials into spark-plug mounting hole.
G643(E) Service Manual Chapter 2. Recommended Maintenance 25 CAUTION Spark plug clearance 0.8~0.9 mm