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 primary drive gear
    1. Remove: Primary drive gear Refer to "BALANCER GEAR" on page 5-53. 2. Check: Primary drive gear Damage/wear  Replace the primary drive gear and clutch housing as a set. Excessive noise during operation Replace the primary drive gear and clutch housing as a set ...

    Replacing a turn signal light bulb
    Remove the turn signal light lens by removing the screw. Screw Remove the burnt-out bulb by pushing it in and turning it counterclockwise. Insert a new bulb into the socket, push it in, and then turn it clockwise until it stops. Install the lens by installing ...

    Checking the clutch housing
    1. Check: Clutch housing dogs "1" Damage/pitting/wear  Deburr the clutch housing dogs or replace the clutch housing. NOTE: Pitting on the clutch housing dogs will cause erratic clutch operation. 2. Check: Bearing Damage/wear Replace the bearing and clutch housin ...

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