ENGINE (YP125R)
3-10
7. Install:
• Spark plug
IP
Before installing the spark plug, clean the spark
plug and gasket surface.
8. Connect:
• Spark plug cap
EAS37P1092
CHECKING THE IGNITION TIMING
IP
Prior to checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure that all connections are tight and free
of corrosion.
1. Stand the vehicle on a level surface.
IP
Place the vehicle on the centerstand.
2. Remove:
• Timing mark accessing plug “1”
3. Connect:
• Timing light “1”
(onto the spark plug lead)
4. Check:
• Ignition timing
▼▼▼▼▼▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼ ▼▼▼▼ ▼▼▼
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
b. Check that the stationary pointer “a” on the
generator cover is within the firing range “b”
on the generator rotor.
Incorrect firing range → Check the ignition
system.
IP
The ignition timing is not adjustable.
▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲
5. Disconnect:
• Timing light
6. Install:
• Timing mark accessing plug
(along with the O-ring )
T
R
.
.
Spark plug
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
Timing light
90890-03141
Inductive clamp timing light
YU-03141
1
Engine idling speed
1600–1800 r/min
T
R
.
.
Timing mark accessing plug
8 Nm (0.8 m·kgf, 5.8 ft·lbf)
1
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