Spark Plug Installation Instructions
It's easy to check, clean or replace spark plugs, by simply following these procedures.
- First leave the engine to cool.
- 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.
- Slacken the plug and clean the recess if necessary.
- Screw in spark plug by hand until it is seated in the cylinder head.
- New spark plugs with flat seats are then tightened by a further approximately 90 using the appropriate spark plug wrench.
- Spark plugs with conical seats as well as used spark plugs with flat seats are screwed in by a further 15 approximately.
- Re-attach the spark plug lead.
- Repeat the procedure for every plug.