Yamaha YZF-R125 Service Manual: Changing the engine oil

1. Remove:

  • Right bottom cowling
  • Right upper side cowling
  • Right lower side cowling Refer to "GENERAL CHASSIS" on page 4-1.

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

3. Place a container under the engine oil drain bolt.

4. Install:

  • Engine oil drain attachment "1" (Located under the rider seat with the owner's tool kit)

Changing the engine oil


5. Remove:

  • Engine oil filler cap (dipstick) "1"
  • Engine oil drain plug "2"
  • O-ring "3"
  • Spring "4"
  • Engine oil strainer "5"

Changing the engine oil


Changing the engine oil


6. Drain:

  • Engine oil (completely from the crankcase)

7. If the oil filter element is also to be replaced, perform the following procedure.

a. Remove the oil filter element cover "1" and oil filter element "2".

b. Install the new O-ring "3".


c. Install the new oil filter element and the oil filter element cover.


8. Check:

  • Engine oil strainer Dirt Clean.

9. Install:

  • Engine oil strainer
  • Spring
  • O-ring

  • Engine oil drain plug 

10.Fill:

  • Crankcase (with the specified amount of the recommended engine oil)


11.Install:

  • Engine oil filler cap

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

13.Check:

  • Engine (for engine oil leaks)

14.Check:

  • Engine oil level Refer to "CHECKING THE ENGINE OIL LEVEL" on page 3-10.

15.Check:

  • Engine oil pressure

a. Slightly loosen the oil check bolt "1".

Changing the engine oil


b. Start the engine and keep it idling until engine oil starts to seep from the oil check bolt. If no engine oil comes out after one minute, turn the engine off so that it will not seize.

c. Check the engine oil passages, the oil filter element and the oil pump for damage or leakage.

Refer to "OIL PUMP" on page 5-47.

d. Start the engine after solving the problem(s) and check the engine oil pressure again.

e. Tighten the oil check bolt to specification.


16.Install:

  • Right lower side cowling
  • Right upper side cowling
  • Right bottom side cowling Refer to "GENERAL CHASSIS" on page 4-1.
    Checking the engine oil level
    1. Stand the vehicle on a level surface. NOTE: Place the vehicle on a suitable stand. Make sure the vehicle is upright. 2. Start the engine, warm it up for several minutes, and then turn it ...

    Adjusting the clutch cable free play
    1. Check: Clutch cable free play "a" Out of specification Adjust. 2. Adjust: Clutch cable free play a. Pull back the rubber cover "1" b. Loosen the locknut "2". c. Turn the adjust ...

    Other materials:

    Checking the shift shaft
    1. Check: Shift shaft Bends/damage/wear Replace. Shift shaft spring Damage/wear Replace. Checking the stopper lever 1. Check: Stopper lever Bends/damage Replace. Roller turns roughly Replace the stopper lever. Stopper lever spring Damage/wear Replace. ...

    Checking the stator coil
    1. Disconnect: Stator coil coupler (from the wire harness) 2. Check: Stator coil resistance Out of specification → Replace the crankshaft position sensor/stator assembly. a. Connect the pocket tester ( × 1) to the stator coil coupler as shown. b. Measure the sta ...

    Removing the generator
    1. Remove: Generator rotor nut "1" Washer NOTE: While holding the generator rotor "2" with the sheave holder "3", loosen the generator rotor nut. Do not allow the sheave holder to touch the projection on the generator rotor. 2. Remove: Generator rotor "1" (with the ...

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