Yamaha YZF-R125 Service Manual: Adjusting the front wheel static balance

Yamaha YZF-R125 Service Manual / Chassis / Front wheel / Adjusting the front wheel static balance

NOTE:

  • After replacing the tire, wheel or both, the front wheel static balance should be adjusted.
  • Adjust the front wheel static balance with the brake discs installed.

1. Remove:

  • Balancing weight(s)

2. Find:

  • Front wheel's heavy spot

NOTE:

Place the front wheel on a suitable balancing stand.

a. Spin the front wheel.

b. When the front wheel stops, put an "X1" mark at the bottom of the wheel.

Adjusting the front wheel static balance


c. Turn the front wheel 90 so that the "X1" mark is positioned as shown.

d. Release the front wheel.

e. When the wheel stops, put an "X2" mark at the bottom of the wheel.

Adjusting the front wheel static balance


f. Repeat steps (c) through (e) several times until all the marks come to rest at the same spot.

g. The spot where all the marks come to rest is the front wheel's heavy spot "X".

3. Adjust:

  • Front wheel static balance

a. Install a balancing weight "1" onto the rim exactly opposite the heavy spot "X".

Adjusting the front wheel static balance


NOTE:

Start with the lightest weight.

b. Turn the front wheel 90 so that the heavy spot is positioned as shown.


c. If the heavy spot does not stay in that position, install a heavier weight.

d. Repeat steps (b) and (c) until the front wheel is balanced.

4. Check:

  • Front wheel static balance

a. Turn the front wheel and make sure it stays at each position shown.


b. If the front wheel does not remain stationary at all of the positions, rebalance it.

    Assembling the front wheel
    1. Install: Wheel bearings Oil seal a. Install the new wheel bearings and oil seal in the reverse order of disassembly. CAUTION:Do not contact the wheel bearing inner race " ...

    Installing the front wheel (disc)
    1. Install: Front brake disc NOTE: Be sure to install the front brake disc with the arrow mark "a" on the disc facing out. Tighten the brake disc bolts in stages and in a crisscross p ...

    Other materials:

    Removing the rear brake master cylinder
    NOTE: Before removing the rear brake master cylinder, drain the brake fluid from the entire brake system. 1. Disconnect: Rear brake light switch coupler 2. Loosen: Rear brake light switch "1" 3. Remove: Rear brake master cylinder bolts Rear brake master cylinder 4. Remove: ...

    Checking the piston rings
    1. Measure: Piston ring side clearance Out of specification Replace the piston and piston rings as a set. NOTE: Before measuring the piston ring side clearance, eliminate any carbon deposits from the piston ring grooves and piston rings. 2. Install: Piston ring (into the cylind ...

    Removing the lower bracket
    1. Stand the vehicle on a level surface. WARNINGSecurely support the vehicle so that there is no danger of it falling over. 2. Remove: Upper ring nut Rubber washer Lower ring nut "1" Lower bracket NOTE: Remove the lower ring nut with the steering nut wrench "2". ...

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