Spark Plug: Adjustment

Clean up the spark plug using nylon brush or equivalent. Clean and remove the carbon or oxide deposits. If deposits are too stubborn, replace the spark plugs.

NOTE:

Never use a plug cleaner.
Never use a metal brush because it makes insulator worn.

Spark plug gap L:

0.7 - 0.8 mm (0.028 - 0.031 in)

Fig 1: Identifying Spark Plug Gap

Courtesy of SUBARU OF AMERICA, INC.