Yamaha YP125R Service Manual

FUEL PUMP SYSTEM
8-59
EAS27570
TROUBLESHOOTING
If the fuel pump fails to operate.
T
IP
• Before troubleshooting, remove the following part(s):
1. Storage box
2. Front cowling
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
1. Check the fuses.
(Main, ECU, and ignition)
Refer to “CHECKING THE FUS-
ES” on page 8-77.
Replace the fuse(s).
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 8-78.
• Clean the battery terminals.
• Recharge or replace the battery.
3. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-73.
Replace the main switch/immobilizer unit.
4. Check the fuel pump operation.
Refer to “CHECKING THE FUEL
PRESSURE” on page 7-3.
Replace the fuel tank (with fuel pump).
5. Check the entire fuel pump system
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-57.
Properly connect or repair the fuel pump
system wiring.
Replace the ECU.

Yamaha YP125R Specifications

General

Engine Type	Liquid-cooled, 4-stroke, SOHC, 4-valve
Bore x Stroke	52.4 mm x 57.9 mm
Fuel System	Fuel Injection
Ignition System	TCI
Transmission	V-Belt Automatic
Front Suspension	Telescopic fork
Rear Suspension	Unit Swing
Front Brake	Hydraulic single disc, Ø267 mm
Starter System	Electric
Rear Tyre	140/70-14M/C 62P (Tubeless)