Yamaha YZF-R125 Service Manual: Changing the coolant

1. Remove:

  • Lower side cowlings Refer to "GENERAL CHASSIS" on page 4-1.

2. Remove:

  • Radiator cap "1"

Changing the coolant


WARNING

A hot radiator is under pressure. Therefore, do not remove the radiator cap when the engine is hot. Scalding hot fluid and steam may be blown out, which could cause serious injury.

When the engine has cooled, open the radiator cap as follows: Place a thick rag or a towel over the radiator cap and slowly turn the radiator cap counterclockwise toward the detent to allow any residual pressure to escape. When the hissing sound has stopped, press down on the radiator cap and turn it counterclockwise to remove.

3. Remove:

  • Coolant drain bolt "1" (along with the copper washer)

Changing the coolant


4. Drain:

  • Coolant (from the engine and radiator)

5. Disconnect:

  • Coolant reservoir hose "1"

6. Remove:

  • Coolant reservoir cap "2"

Changing the coolant


7. Drain:

  • Coolant (from the coolant reservoir)

8. Connect:

  • Coolant reservoir hose

9. Install:

  • Coolant drain bolt (along with the copper washer )

10.Fill:

  • Cooling system (with the specified amount of the recommended coolant)

Handling notes for coolant Coolant is potentially harmful and should be handled with special care.

WARNING
  • If coolant splashes in your eyes, thoroughly wash them with water and consult a doctor.
  • If coolant splashes on your clothes, quickly wash it away with water and then with soap and water.
  • If coolant is swallowed, induce vomiting and get immediate medical attention.
CAUTION:
  • Adding water instead of coolant lowers the antifreeze content of the coolant. If water is used instead of coolant, check and, if necessary, correct the antifreeze concentration of the coolant.
  • Use only distilled water. However, if distilled water is not available, soft water may be used.
  • If coolant comes into contact with painted surfaces, immediately wash them with water.
  • Do not mix different types of antifreeze.

11.Install:

  • Radiator cap

12.Fill:

  • Coolant reservoir (with the recommended coolant to the maximum level mark "a")

13.Install:

  • Coolant reservoir cap

14.Start the engine, warm it up for several minutes, and then turn it off.

15.Check:

  • Coolant level Refer to "CHECKING THE COOLANT LEVEL" on page 3-15.

NOTE:

Before checking the coolant level, wait a few minutes until the coolant has settled.

16.Install:

  • Lower side cowlings Refer to "GENERAL CHASSIS" on page 4-1.
    Checking the cooling system
    1. Remove: Side covers Upper side cowlings Refer to "GENERAL CHASSIS" on page 4-1. 2. Check: Radiator "1" Radiator inlet hose "2" Radiator outlet hose "3" Coolant reservoir hose ...

    Chassis
    ...

    Other materials:

    Checking the camshaft
    1. Check: Camshaft lobes Blue discoloration/pitting/scratches  Replace the camshaft. 2. Measure: Camshaft lobe dimensions "a" and "b" Out of specification Replace the camshaft. 3. Check: Camshaft oil passage Obstruction Blow out with compressed air. ...

    Checking the piston rings
    1. Measure: Piston ring side clearance Out of specification Replace the piston and piston rings as a set. NOTE: Before measuring the piston ring side clearance, eliminate any carbon deposits from the piston ring grooves and piston rings. 2. Install: Piston ring (into the cylind ...

    Multi-function display
    Multi-function display Multi-function display "RESET/SELECT" button WARNING Be sure to stop the vehicle before making any setting changes to the multi-function display. Changing settings while riding can distract the operator and increase the risk of an accident. The multi- ...

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