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 fuel line
    1. Remove: Left side panel Refer to "GENERAL CHASSIS" on page 4-1. 2. Lift the fuel tank. (Do not disconnect the fuel hose, drain hose 3. Check: Fuel hose "1" Cracks/damage → Replace. Loose connection Connect properly. 4. Install: Fuel tank Refer to "FUEL TANK" on pa ...

    Replacing the rear brake pads
    NOTE: When replacing the brake pads, it is not necessary to disconnect the brake hose or disassemble the brake caliper. 1. Remove: Brake pads Brake pad spring NOTE: To remove the inner brake pad "1", push down on the brake caliper bracket so that there is space to remove the brake pa ...

    Fuel tank cap
    Fuel tank cap Fuel tank cap lock cover Unlock. To remove the fuel tank cap Open the fuel tank cap lock cover. Insert the key into the lock and turn it 1/4 turn counterclockwise. The lock will be released and the fuel tank cap can be removed. To install the fuel tank ca ...

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