Yamaha YZF-R125 Service Manual: Removing the throttle body

Yamaha YZF-R125 Service Manual / Fuel system / Throttle body / Removing the throttle body

1. Extract the fuel in the fuel tank through the fuel tank filler hole with a pump.

2. Disconnect:

Fuel hose

WARNING

Cover the fuel hose connections with a cloth when disconnecting them. Residual pressure in the fuel lines could cause fuel to spurt out when removing the hoses.

NOTE:

To remove the fuel hose from the fuel injector, slide the fuel hose connector cover "1" on the end of the hose in the direction of the arrow shown, press the two buttons "2" on the sides of the connector, and then remove the hose.
Remove the fuel hose manually without using any tools.
Before removing the hose, place a few rags in the area under where it will be removed.

Removing the throttle body

3. Remove:

Throttle body

CAUTION:

Do not remove the throttle body sensor assembly "1" from the throttle body.

Removing the throttle body

Checking the fuel injector

1. Check:

Fuel injector Damage Replace.

Checking the throttle body

1. Check: Throttle body Cracks/damage Replace the throttle body. 2. Check: Fuel passages Obstruction Clean. a. Wash the throttle body in a petroleum-based solvent. Do not us ...

Other materials:

Checking the ignition coil
1. Check: Primary coil resistance Out of specification Replace. a. Disconnect the ignition coil connectors from the ignition coil terminals. b. Connect the pocket tester ( × 1) to the ignition coil as shown. Positive tester probe red/white "1" Negative tester probe orange ...

Checking the cylinder head
1. Eliminate: Combustion chamber carbon deposits (with a rounded scraper) NOTE: Do not use a sharp instrument to avoid damaging or scratching: Spark plug bore threads Valve seats 2. Check: Cylinder head Damage/scratches Replace. Cylinder head water jacket Min ...

Disassembling the front fork legs
The following procedure applies to both of the front fork legs. 1. Remove: Rubber cap Clip "1" Front fork cap "2" (with O-ring) Fork spring NOTE: Push the front fork cap in the direction of the arrow shown in the illustration to remove the clip. 2. Drain: Fork oil NOTE ...