Yamaha YZF-R125, Service Manual

Page: 81 / 356

ENGINE
3-8
8. Install:
• Spark plug
NOTE:
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Connect:
• Spark plug cap
10.Install:
• Right side cover
Refer to “GENERAL CHASSIS” on page 4-1.
EAS20700
CHECKING THE IGNITION TIMING
NOTE:
Prior to checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure all connections are tight and free of
corrosion.
1. Remove:
• Rider seat
• Left lower side cowling
Refer to “GENERAL CHASSIS” on page 4-1.
2. Remove:
• Timing mark accessing screw “1”
3. Lift the fuel tank. (Do not disconnect the fuel
hose, fuel drain hose, and couplers.)
Refer to “FUEL TANK” on page 7-1.
4. Connect:
• Timing light “1”
• Digital tachometer
5. 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 stationary pointer “a” in the gener-
ator cover is within the firing range “b” on the
generator rotor.
Incorrect firing range
→
Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
6. Remove:
• Digital tachometer
• Timing light
7. Install:
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
T
R
.
.
Spark plug
13 Nm (1.3 m·kg, 9.4 ft·lb)
1
Timing light
90890-03141
Inductive clamp timing light
YU-03141
Engine idling speed
1300–1500 r/min
1
a
b
YamahaR125.COM