Page 628 - 2006 HARLEY FLSTCI SERVICE MANUAL

1.21 Verify that cables are 1-43

Figure 1-52. Typical Spark Plug Deposits Check electrode gap with a wire-type feeler gauge. Bend the outside of the electrode so only a slight drag on the gauge is felt when passing it between electrodes. Proper gap measurement is 0.038-0.043 in. (0.97-1.09 mm). Check condition of threads on cylinder head and plug. If necessary to remove deposits, apply penetrating oil and clean out with a thread chaser. Apply LOCTITE ANTI-SEIZE to plugs. Install and tighten to 12-18 ft-lbs (16.3-24.4 Nm). Connect spark plug cables. Rear cylinder plug cable attaches to top coil terminal. securely connected

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SPARK PLUGS INSPECTION After the engine has cooled to room temperature, discon- nect cables from both spark plugs. Remove spark plugs. If a plug has eroded electrodes, heavy deposits or a cracked insulator, discard it. See Figure 1-52. Compare your observations of the plug deposits with the descriptions provided below. A wet, black and shiny deposit on plug base, elec- trodes and ceramic insulator tip indicates an oil fouled plug. The condition may be caused by one or more of the following: worn pistons, worn piston rings, worn valves, worn valve guides, worn valve seals, a weak battery or a faulty ignition system. A dry, fluffy or sooty black depos

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