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:
Adjusting the valve clearance
The following procedure applies to all of the
valves.
NOTE:
Valve clearance adjustment should be made
on a cold engine, at room temperature.
When the valve clearance is to be measured or
adjusted, the piston must be at top dead center
(TDC) on the compression stroke.
1. Remove:
...
Checking the spark plug
1. Remove:
Right side cover
Refer to "GENERAL CHASSIS" on page 4-1.
2. Disconnect:
Spark plug cap
3. Remove:
Spark plug
CAUTION:Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from falling
...
Intake air temperature sensor
1. Check:
Intake air temperature sensor resistance
Out of specification Replace
the throttle
body.
a. Connect the pocket tester ( ×
1k) to the
throttle body sensor assembly coupler as
shown.
Positive tester probe
brown/white "1"
Negative tester probe
gray/black ...