Yamaha WR125R 2009 Service Manual

FUEL PUMP SYSTEM
8-57
EAS27570
TROUBLESHOOTING
If the fuel pump fails to operate.
T
IP
• Before troubleshooting, remove the following part(s):
1. Battery cover
2. Fuel tank
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
1. Check the fuses.
(Main and ignition)
Refer to “CHECKING THE FUS-
ES” on page 8-65.
Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 8-65.
• Refill battery fluid.
• Clean the battery terminals.
• Recharge or replace the battery.
3. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-61.
Replace the main switch.
4. Check the engine stop switch.
Refer to “CHECKING THE
SWITCHES” on page 8-61.
The engine stop switch is faulty. Replace
the right handlebar switch.
5. Check the fuel pump operation.
Refer to “CHECKING THE FUEL
PRESSURE” on page 7-3.
Replace the fuel pump.
6. Check the entire fuel pump system
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-55.
Properly connect or repair the fuel pump
system wiring.
Replace the ECU.

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