Teach you how to check the spark plugs Buell Lightning XB12S

Check spark plugs:

• Replace every 10,000 mile (16,000 km) service interval.
• Use only Harley-Davidson 10R12A spark plugs.

1. Remove left side air scoop to access front cylinder spark
plug. See2.38 AIR SCOOPS.

2. Disconnect spark plug wire from front spark plug.
3. Using a 5/8 in. box end wrench and 5/8 in. spark plug socket, remove front spark plug.
4. Remove seat. See2.43 SEAT.
5. Remove air cleaner assembly. See2.37 INTAKE COVER ASSEMBLY/4.44 AIR CLEANER ASSEMBLY.
6. Disconnect spark plug wire from rear spark plug (use automotive spark plug boot remover/installer if required).
7. Using a 5/8 in. wobble socket and 12 in. extension, remove rear spark plug.
8. SeeFigure 1-37.Compare your observations of the plug deposits with the descriptions provided below.

a. A wet, black and shiny deposit on plug base, electrodes 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.

b.A dry, fluffy or sooty black deposit indicates an airfuel mixture that is too rich and/or engine idling for excessive periods.

c. A light brown, glassy deposit indicates an overheated plug. This condition may be accompanied by cracks in the insulator or by erosion of the electrodes and is caused by an air-fuel mixture that is too lean, a hot-running engine, valves not seating or improper ignition timing. The glassy deposit on the spark plug is a conductor when hot and may cause high-speed misfiring. A plug with eroded electrodes, heavy deposits or a cracked insulator must be replaced.

d. A plug with a white, yellow, tan or rusty brown powdery deposit indicates balanced combustion. Clean off spark plug deposits at regular intervals