EGL A08(A) - Spark Plug Service

BASIC MAINTENANCE PROCEDURESBASIC MAINTENANCE PROCEDURES
e recommended standard spark plug will work very well in most riding condition. However, if you plan on rid-
ing for extended periods of time at high speed or high engine rpm in hot climates, or plan extended riding in cold
climates, a dierent plug may be recommended.
Use only the recommended type of spark plug.
STANDARD - U24ESR-NB (DENSO)STANDARD - U24ESR-NB (DENSO)
SPARK PLUG SPARK PLUG
A fouled (dirty) spark plug can cause your motorcycle to run poorly and lose performance. Follow the steps below
to inspect, clean and/or replace the spark plug if needed.
1. Clean any dust or dirt from around the spark plug base area thoroughly to prevent dirt from entering the
cylinder.
2. Disconnect the spark plug cap.
3. Remove the spark plug.
4. Using the photos below for a reference, examine the spark plug to determine its cleanliness. If the plug
has a normal color, GO TO STEP 6. If the spark plug is fouled (dirty), GO TO STEP 5.
5. Using a moderate grit sandpaper (220-400), sand between the center electrode and the side electrode
until all carbon and oil deposits are removed. We recommend that you use a spark plug cleaner or a new
spark plug is the old spark plug is very dirty.
6. Check the electrodes for wear or deposits, the sealing ring for damage and the insulator for cracks or
chips. e center electrode should be nicely rounded or have square edges (depending on the type of
spark plug you are using) the side electrode should not be eroded at all. Replace the spark plug if you
detect either.
7. Check the spark plug gap using a wire type feeler gauge. If the gap is not as specied, replace the spark
plug with a new one.
8. Be sure all dirt has been cleaned form the threads if you are using he old spark plug. Install the spark plug
by hand rst. is will prevent stripping and/or cross threading the threads. Use the appropriate socket or
wrench to securely tighten the spark plug. Do not over or under tighten the spark plug.
9. Tightening the spark plug:
1/8 turn aer it seats.
A. If using the old spark plug:
1. First, tighten the spark plug 1/2 turn aer it seats.
2. en loosen the spark plug.
3. Next, tighten the spark plug again:
1/8 turn aer it seats.