Cleaning and adjusting spark plugs

Remove the spark plugs and clean them using a wire brush. Clean the electrode points using emery paper or a fine file and then reset the gaps. To reset the gap. bend the outer electrode to bring it closer to or further from the central electrode, until a feeler gauge of the correct size can just be slid between the gap. Never bend the central electrode or the insulator will crack, causing engine damage if the particles fall in whilst the engine is running. The correct plug gap is 0.7 - 0.8 mm (0.028 - 0.032 in). Before refitting the plugs, smear the threads with a small quantity of graphite grease to aid subsequent removal.

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