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HONDA O/M ’04 CR125R (E) (AH) 31KSR600
SPARK PLUG
Standard:
(NGK) BR9EG,
(DENSO) W27ESR-V
Optional:
(NGK) BR9EV,
(DENSO) W27ESR-G
If replacing with any other brand of spark plug, be cer-
tain to select the correct reach and heat range. Before
removing the spark plug, clean the spark plug area
thoroughly to prevent dirt from entering the cylinder.
CAUTION:
•
The use of a spark plug of the incorrect reach or
heat range can cause engine damage. The use of a
non-resistor spark plug may cause ignition
problems.
1. Measure spark plug gap with a feeler gauge, and
adjust by carefully bending the side electrode.
The recommended spark plug gap is:
0.020—0.024 in (0.5—0.6 mm).
2. Check the electrode for wear or deposits, the gasket
for damage, and the insulator for cracks.
(1) PLUG GAP
(2) SIDE ELECTRODE
(3) SEALING GASKET
3. To obtain accurate spark plug readings, accelerate
up to speed on a straightaway. Push the engine stop
button and disengage the clutch by pulling the lever
in.
Coast to a stop, then remove and inspect the spark
plug. The porcelain insulator around the center
electrode should appear tan or medium gray.
NOTE:
•
If you’re using a new plug, ride for at least ten
minutes before taking a plug reading; a brand-new
plug will not color initially.
If the electrodes appear burnt, or the insulator is white
or light gray (lean) or the electrodes and insulator are
black or fouled (rich), there is a problem elsewhere
(page 52).
Check the fuel/oil mixture, carburetor and fuel system,
and ignition timing.
4. Install the spark plug by hand until finger tight, then
tighten with a wrench until the sealing gasket is
compressed (1/2 turn to compress a new spark plug
gasket, 1/8—1/4 turn to compress a spark plug with
a used gasket).
(1) SPARK PLUG
IGNITION
A CDI (Capacitive Discharge lgnition) system is used on
your CR; consequently, routine ignition timing adjust-
ment is unnecessary. If you want to check the ignition
timing, refer to the Honda Service Manual.
4. SERVICE AND MAINTENANCE
*CR125R (E) P011-023
12/10/03, 2:50 PM
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