REMOVAL & INSTALLATION

1. Number the wires so that you won't cross them when you reinstall them.
2. Remove the wire from the end of the spark plug by grasping the wire by the rubber boot. If the boot sticks to the plug, remove it by twisting and pulling at the same time. Do not pull the wire itself or you will damage the core.
3. Use a ¹³⁄₁₆ in. spark plug socket to loosen all of the plugs about two turns.

   WARNING
   The cylinder head is cast from aluminum. Remove the spark plugs when the engine is cold, if possible, to prevent damage to the threads.

   If removal of the plugs is difficult, apply a few drops of penetrating oil or silicone spray to the area around the base of the plug, and allow it a few minutes to work.

4. If compressed air is available, apply it to the area around the spark plug holes. Otherwise, use a rag or a brush to clean the area. Be careful not to allow any foreign material to drop into the spark plug holes.
5. Remove the plugs by unscrewing them the rest of the way from the engine.

   Fig. 1: A variety of tools and gauges are needed for spark plug service

   To install:

6. Lubricate the threads of the spark plugs with a drop of oil. Install the plugs and hand-tighten them. Take care not to cross-thread them.
7. Tighten the spark plugs with the socket. Do not apply the same amount of force you would use for a bolt. Just snug them in. If a torque wrench is available, tighten to 11–15 ft. lbs. (14–20 Nm)
8. Install the wires on their respective plugs. Make sure the wires are firmly connected. You will be able to feel them click into place.