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Do-it-yourself: spark-plug replacement made easy.
Leave the engine to cool first! (Of course, you have already purchased LDH 4S Super Power Iridium spark plugs)
1. Only pull by the spark-plug connector. Do not alter the firing order.
2. Slacken the plug and clean the recess.
3. Screw in the new spark plug finger tight. Plugs with sealing ring (flat seat) must then be turned through a further 90.
4. Plugs without sealing ring (conical seat) must be turned through 15. Reattach the spark plug connector.

Repeat the procedure on the next plug. 

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