Yamaha WR125R 2009 Service Manual

ENGINE
3-5
c. Turn the adjusting screw “3” in direction “a” or
“b” until the specified valve clearance is ob-
tained.
d. Hold the adjusting screw to prevent it from
moving and tighten the locknut to specifica-
tion.
e. Measure the valve clearance again.
f. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjust-
ment steps until the specified clearance is
obtained.
▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲
7. Install:
• All removed parts
T
IP
For installation, reverse the removal procedure.
EAS20600
ADJUSTING THE EXHAUST GAS VOLUME
T
IP
Be sure to set the CO density level to standard,
and then adjust the exhaust gas volume.
1. Remove:
• Seat
Refer to “GENERAL CHASSIS” on page 4-1.
2. Set the main switch to “OFF”.
3. Disconnect:
• Self-diagnosis signal coupler “1”
4. Connect:
• FI diagnostic tool “2”
5. While pressing the “MODE” button “1”, turn
the main switch to “ON”.
T
IP
•“DIAG” appears on the LCD “2” of the FI diag-
nostic tool.
•“POWER” LED (Green) “3” comes on.
6. Press the “UP” button “4” to select the CO ad-
justment mode “CO” or the diagnostic mode
“DIAG”.
Direction “a”
Valve clearance is increased.
Direction “b”
Valve clearance is decreased.
Tappet adjusting tool
90890-01311
Six piece tappet set
YM-A5970
T
R
.
.
Valve adjusting screw locknut
7 Nm (0.7 m·kgf, 5.1 ft·lbf)
1
2
3
a
b
b
b
FI diagnostic tool
90890-03182
2
1
FI Diagnostic Tool
DIAG
1
2
3
4

Yamaha WR125R 2009 Specifications

General

Engine Type	Liquid-cooled, 4-stroke, SOHC, 4-valve
Displacement	124.7cc
Bore x Stroke	52.0 mm x 58.6 mm
Compression Ratio	11.2:1
Fuel System	Fuel Injection
Ignition System	TCI
Starter System	Electric
Final Drive	Chain
Front Brake	Hydraulic single disc
Rear Brake	Hydraulic single disc
Seat Height	930 mm
Lubrication System	Wet sump
Rear Brake Diameter	220 mm
Overall Length	2, 180 mm
Overall Width	835 mm
Wheel Base	1, 430 mm
Transmission	6-speed
Front Suspension	Telescopic fork
Rear Suspension	Swingarm
Front Tire	80/90-21
Fuel Capacity	8.5 liters
Maximum Power	11.0 kW (15.0 PS) @ 9, 000 rpm
Maximum Torque	12.2 Nm (1.2 kg-m) @ 8, 000 rpm
Transmission System	Constant mesh
Frame	Steel
Oil Tank Capacity	1.15 litres