Yamaha YZF-R125 Service Manual: Air induction system

Air induction system


1. Air induction system hose (air filter case to reed valve assembly) 2. Air induction system reed valve assembly

3. Air induction system hose (reed valve assembly to exhaust pipe)

Air induction system


Checking the air induction system

Air injection

The air induction system burns unburned exhaust gases by injecting fresh air (secondary air) into the exhaust port, reducing the emission of hydrocarbons. When there is negative pressure at the exhaust port, the reed valve opens, allowing secondary air to flow into the exhaust port.

The required temperature for burning the unburned exhaust gases is approximately 600 to 700 C (1112 to 1292 F).

1. Check:

  • Hoses Loose connections Connect
    properly.

    Cracks/damage Replace.


  • Cracks/damage  Replace.

2. Check:

  • Air induction system reed valve assembly operation

a. Blow air into the pipe "1" of the air induction system reed valve assembly and check that it comes out from the pipe "2".

b. Blow air into the pipe "2" of the air induction system reed valve assembly and check that it does not come out from the pipe "1".

Checking the air induction system


c. If faulty, replace the air induction system reed valve assembly.

    Installing the throttle body
    1. Install: Throttle body joint clamps NOTE: Align the projections "a" on the throttle body joint with the slot "b" in each throttle body joint clamp. 2. Install: Throttle body joint ...

    Electrical system
    ...

    Other materials:

    Parking
    When parking, stop the engine, and then remove the key from the main switch. WARNING Since the engine and exhaust system can become very hot, park in a place where pedestrians or children are not likely to touch them and be burned. Do not park on a slope or on soft ground, ...

    Installing the front brake caliper
    1. Install: Brake caliper "1" (temporarily) Copper washers "2" Brake hose "3" Brake hose union bolt "4" WARNINGProper brake hose routing is essential to insure safe vehicle operation. Refer to "CABLE ROUTING" on page 2-33. CAUTION: Install the brake ...

    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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