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.

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