Yamaha YZF-R125 Service Manual: Checking and adjusting the steering head

Yamaha YZF-R125 Service Manual / Periodic checks and adjustments / Chassis / Checking and adjusting the steering head

1. Stand the vehicle on a level surface

WARNING

Securely support the vehicle so that there is no danger of it falling over.

NOTE:

Place the vehicle on a suitable stand so that the front wheel is elevated.

2. Check:

  • Steering head Grasp the bottom of the front fork legs and gently rock the front fork.

    Binding/looseness → Adjust the steering head.

3. Remove:

  • Upper bracket Refer to "STEERING HEAD" on page 4-52.

4. Adjust:

  • Steering head

a. Remove the lock washer "1", the upper ring nut "2", and the rubber washer "3".

Checking and adjusting the steering head


b. Tighten the lower ring nut "4" with a steering nut wrench "5".

NOTE:

Set the torque wrench at a right angle to the steering nut wrench.

Checking and adjusting the steering head




c. Loosen the lower ring nut "4" completely, and then tighten it to specification with a steering nut wrench.

WARNING

Do not overtighten the lower ring nut.


d. Check the steering head for looseness or binding by turning the front fork all the way in both directions. If any binding is felt, remove the lower bracket and check the upper and lower bearings.

Refer to "STEERING HEAD" on page 4-52.

e. Install the rubber washer "3".

f. Install the upper ring nut "2".

g. Finger tighten the upper ring nut "2", and then align the slots of both ring nuts. If necessary, hold the lower ring nut and tighten the upper ring nut until their slots are aligned.

NOTE:

Make sure the lock washer tabs "a" sit correctly in the ring nut slots "b".

Checking and adjusting the steering head


5. Install:

  • Upper bracket Refer to "STEERING HEAD" on page 4-52.
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    Other materials:

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    1. Install: Woodruff key Generator rotor Washer Generator rotor nut NOTE: Clean the tapered portion of the crankshaft and the generator rotor hub. When installing the generator rotor, make sure the woodruff key is properly sealed in the keyway of the crankshaft. 2. Tighte ...

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