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 ...

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    Other materials:

    Adjusting the drive chain slack
    NOTE: The drive chain slack must be checked at the tightest point on the chain. CAUTION:A drive chain that is too tight will overload the engine and other vital parts, and one that is too loose can skip and damage the swingarm or cause an accident. Therefore, keep the drive ...

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    Operation and important riding points
    Read the Owner's Manual carefully to become familiar with all controls. If there is a control or function you do not understand, ask your Yamaha dealer. WARNING Failure to familiarize yourself with the controls can lead to loss of control, which could cause an accident or injury. TIP ...

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