Service Information - Honda CBR125R Owner's Manual

SERVICE INFORMATION

GENERAL
• Work in a well ventilated area. Smoking or allowing flames or sparks in the work area or where gasoline is stored can
cause a fire or explosion.
• Before disconnecting the fuel feed hose, relieve fuel pressure from the system by disconnecting the quick connect fit-
ting at the fuel pump (page 5-44).
• Bending or twisting the control cables will impair smooth operation and could cause the cables to stick or bind, result-
ing in loss of vehicle control.
• Do not apply commercially available carburetor cleaners to the inside of the throttle bore.
• Do not snap the throttle valve from full open to full close after the throttle cable has been removed. It may cause incor-
rect idle operation.
• Seal the intake ports with tape or a clean cloth to keep dirt and debris from entering the engine after the throttle body
has been removed.
• Do not damage the throttle body. It may cause incorrect throttle valve operation.
• Prevent dirt and debris from entering the throttle bore and air passages after the throttle body has been removed. Clean
them using a compressed air if necessary.
• The throttle body is factory pre-set. Do not disassemble in a way other than shown in this manual.
• Do not loosen or tighten the white painted nut and screw of the throttle body. Loosening or tightening them can cause
throttle valve and idle control failure.
• The parts of the throttle body not shown in this manual should not be disassembled.
• Always replace the packing when the fuel pump is removed.
• A faulty PGM-FI system is often related to poorly connected or corroded connectors. Check those connections before
proceeding.
• The PGM-FI system is equipped with the Self-Diagnostic System described (page 5-10). If the MIL blinks, follow the Self-
Diagnostic Procedures to remedy the problem.
• When checking the PGM-FI system, always follow the steps in the troubleshooting table.
• The PGM-FI system is provided with fail-safe function to secure a minimum running capability even when there is any
trouble in the system. When any abnormality is detected by the self-diagnosis function, running capability is secured by
making use of the numerical values of a situation preset in advance in the simulated program map.
It must be remembered, however, that when any abnormality is detected in injector, the fail-safe function stops the
engine to protect it from damage.
• For PGM-FI system location (page 5-6).
• When disassembling the PGM-FI system parts, note the location of the O-rings. Replace them with new ones upon reas-
sembly.
• Use a digital tester for PGM-FI system inspection.
• For fuel level sensor inspection (page 19-21).
SPECIFICATIONS
Throttle body identification number
Engine idle speed
Throttle grip freeplay
Fuel injector resistance (20°C/68°F)
Fuel pressure at idle
Fuel pump flow (at 12 V)
TORQUE VALUES
Bank angle sensor mounting screw
ECT sensor
Fuel pump setting plate nut
Injector joint mounting bolt
O sensor
2
Sensor unit torx screw
IACV setting plate torx screw
Throttle cable stay screw
Insulator band screw
Air cleaner cover screw
ITEM
1.2 N·m (0.1 kgf·m, 0.9 lbf·ft)
24.5 N·m (2.5 kgf·m, 18 lbf·ft)
5.1 N·m (0.5 kgf·m, 3.8 lbf·ft)
25 N·m (2.5 kgf·m, 18 lbf·ft)
3.4 N·m (0.3 kgf·m, 2.5 lbf·ft)
2.1 N·m (0.2 kgf·m, 1.5 lbf·ft)
3.4 N·m (0.3 kgf·m, 2.5 lbf·ft)
1.2 N·m (0.1 kgf·m, 0.9 lbf·ft)
SPECIFICATIONS
GQ16A
1,450 ± 100 min
2 – 6 mm (1/16 – 1/4 in)
9 – 12 Ω
294 kPa (3.0 kgf/cm
3
13.9 cm (0.47 US oz, 0.49 lmp oz) minimum/10 seconds
– For tightening sequence (page 5-50)
– See page 5-57
FUEL SYSTEM (PGM-FI)
-1
(rpm)
2
, 43 psi)
5-3