Yamaha YZF-R125 Service Manual: Checking the fuel pressure

Yamaha YZF-R125 Service Manual / Fuel system / Fuel tank / Checking the fuel pressure

1. Check:

  • Pressure regulator operation

a. Remove the fuel hose connector cover "1" and disconnect the fuel hose "2" from the fuel pump.

CAUTION:

Although the fuel has been removed from the fuel tank, be careful when removing the fuel hose, since there may be fuel remaining in it.

NOTE:

Before removing the hose, place a few rags in the area under where it will be removed.

Checking the fuel pressure


b. Connect the pressure gauge "3" and fuel pressure adapter "4".


Checking the fuel pressure


c. Start the engine.

d. Measure the fuel pressure.


Faulty Replace the fuel tank (with fuel pump).

e. Connect the fuel hose and install the fuel hose connector cover.

Refer to "INSTALLING THE FUEL HOSE" on page 7-2.

    Installing the fuel hose
    1. Install: Fuel hose Fuel hose connector cover CAUTION:When installing the fuel hose, make sure that it is securely connected, and that the fuel hose connector cover is in t ...

    Throttle body
    ...

    Other materials:

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    To remove the rider seat Insert the key into the seat lock, and then turn it clockwise. Seat lock Open. Pull the rider seat off. To install the rider seat 1. Insert the projection on the front of the rider seat into the seat holder as shown. Projection ...

    Removing the front fork legs
    The following procedure applies to both of the front fork legs. 1. Stand the vehicle on a level surface. WARNINGSecurely support the vehicle so that there is no danger of it falling over. 2. Loosen: Handlebar pinch bolt "1" Handlebar bolt "2" Upper bracket ...

    Checking the starter motor
    1. Check: Commutator Dirt Clean with 600 grit sandpaper. 2. Measure: Commutator diameter "a" Out of specification Replace the starter motor. 3. Measure: Mica undercut "a" Out of specification Scrape the mica to the proper measurement with a hacksaw blade ...

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