Yamaha YZF-R125 Service Manual: Installing the thermostat
1. Install:
- Thermostat
NOTE:
Install the thermostat with its breather hole "a"
facing up.
2. Install:
- Copper washer
- Coolant temperature sensor
| CAUTION: Use extreme care when handling the coolant temperature sensor. Replace any part that was dropped or subjected to a strong impact. |
3. Fill:
- Cooling system (with the specified amount of the recommended coolant) Refer to "CHANGING THE COOLANT" on page 3-15.
4. Check:
- Cooling system
Leaks
Repair or replace any
faulty part.
5. Measure:
- Radiator cap opening pressure
Below the specified pressure
Replace the radiator cap.Refer to "CHECKING THE RADIATOR" on page 6-3.
Checking the thermostat
1. Check:
Thermostat
Does not open at 80.5-83.5 C (176.9-182.3
F) Replace.
a. Suspend the thermostat "1" in a container "2"
filled with water.
b. Slowly heat the water "3".
c. ...
Water pump
...
Other materials:
Checking the timing chain tensioner
1. Check:
Timing chain tensioner
Cracks/damage/rough movement Replace.
a. Lightly press the timing chain tensioner rod
into the timing chain tensioner housing by
hand.
NOTE:
While pressing the timing chain tensioner rod,
wind it clockwise with a thin screwdriver "1" until
it stops.
b. ...
Circuit diagram
4. Main fuse
5. Main switch
9. Battery
25.ECU (engine control unit)
36.License plate light
37.Tail/brake light
44.Headlight relay
46.Pass switch
47.Dimmer switch
51.Headlight (low beam)
52.Auxiliary light
54.Headlight (high beam)
58.Meter light
60.High beam indicator light
64.Ignit ...
Tires
To maximize the performance, durability,
and safe operation of your motorcycle,
note the following points regarding
the specified tires.
Tire air pressure
The tire air pressure should be checked
and, if necessary, adjusted before each
ride.
WARNING
Operation of this vehicle with impro ...