Yamaha YZF-R125 Service Manual: Cleaning the air filter element

NOTE:

There is a check hose "1" at the bottom of the air filter case. If dust and/or water collects in this hose, clean the air filter element and air filter case.

Cleaning the air filter element


1. Remove:

  • Rider seat Refer to "GENERAL CHASSIS" on page 4-1.

2. Remove:

  • Fuel tank Refer to "FUEL TANK" on page 7-1.

3. Remove:

  • Air filter case cover "1"
  • Air filter element

Cleaning the air filter element


4. Clean:

  • Air filter element "1" Apply compressed air to the outer surface of the air filter element.

Cleaning the air filter element


5. Check:

  • Air filter element Damage Replace.

6. Install:

  • Air filter element
  • Air filter case cover (along with the gaskets)
CAUTION:

Never operate the engine without the air filter element installed. Unfiltered air will cause rapid wear of engine parts and may damage the engine. Operating the engine without the air filter element will also affect throttle body tuning, leading to poor engine performance and possible overheating.

NOTE:

Make sure the air filter element is properly installed in the air filter case.

7. Install:

  • Fuel tank Refer to "FUEL TANK" on page 7-1.
  • Rider seat Refer to "GENERAL CHASSIS" on page 4-1.
    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 ...

    Checking the throttle body joint and air filter case joint
    1. Remove: Right lower side cowling Left lower side cowling Refer to "GENERAL CHASSIS" on page 4-1. 2. Check: Throttle body joint "1" Air filter case joint "2" Cracks/damage Replace ...

    Other materials:

    Checking the timing chain tensioner
    1. Check: Timing chain tensioner Cracks/damage/rough movement Replace. a. Lightly press the timing chain tensioner rod into the timing chain tensioner housing by hand. NOTE: While pressing the timing chain tensioner rod, wind it clockwise with a thin screwdriver "1" until it stops. b. ...

    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 ...

    Intake air pressure sensor
    1. Check: Intake air pressure sensor output voltage Out of specification Replace the throttle body. a. Connect the pocket tester (DC 20 V) to the throttle body sensor assembly coupler as shown. Positive tester probe pink/white "1" Negative tester probe gray/black "2" ...

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