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Spark Plug Installation Instructions

It's easy to check, clean or replace spark plugs, by simply following these procedures.

  1. First leave the engine to cool.
  2. Twist and pull off the spark plug lead. To ensure you don't alter the firing order we advise you to remove one plug at a time.
  3. Slacken the plug and clean the recess if necessary.
  4. Screw in spark plug by hand until it is seated in the cylinder head.
  5. New spark plugs with flat seats are then tightened by a further approximately 90 using the appropriate spark plug wrench.
  6. Spark plugs with conical seats as well as used spark plugs with flat seats are screwed in by a further 15 approximately.
  7. Re-attach the spark plug lead.
  8. Repeat the procedure for every plug.