Yamaha YZF-R125 Service Manual: Changing the engine oil

Yamaha YZF-R125 Service Manual / Periodic checks and adjustments / Engine / 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

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:

Setting the diagnostic mode
1. Set the main switch to "OFF" and the engine stop switch to " ". 2. Disconnect the self-diagnosis signal connector "1", and then connect the FI diagnostic tool "2" as shown. 3. Disconnect the fuel pump coupler. 4. While pressing the "MODE" button, set the main switch to "ON". NOTE: ...

Checking the piston pin
1. Check: Piston pin Blue discoloration/grooves Replace the piston pin and then check the lubrication system. 2. Measure: Piston pin outside diameter "a" Out of specification Replace the piston pin. 3. Measure: Piston pin bore diameter "b" Out of specifica ...

Checking the valve springs
The following procedure applies to all of the valve springs. 1. Measure: Valve spring free length "a" Out of specification Replace the valve spring. 2. Measure: Compressed valve spring force "a" Out of specification Replace the valve spring. b. Installed length 3. ...