Yamaha YZF-R125 Owners Manual: Drive chain slack
The drive chain slack should be checked before each ride and adjusted if necessary.
To check the drive chain slack
- Place the motorcycle on the sidestand.
TIP
When checking and adjusting the drive
chain slack, there should be no weight
on the motorcycle.
- Shift the transmission into the neutral position.
- Move the rear wheel by pushing the motorcycle to locate the tightest portion of the drive chain, and then measure the drive chain slack as shown.
| Drive chain slack: 30.0-40.0 mm (1.18-1.57 in) |
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Drive chain slack
- If the drive chain slack is incorrect, adjust it as follows.
To adjust the drive chain slack
- Loosen the axle nut and the locknut on each side of the swingarm.
-
Axle nut
-
Drive chain slack adjusting bolt
-
Locknut
-
Alignment marks
- To tighten the drive chain, turn the drive chain slack adjusting bolt on each side of the swingarm in direction (a). To loosen the drive chain, turn the adjusting bolt on each side of the swingarm in direction (b), and then push the rear wheel forward. NOTICE: Improper drive chain slack will overload the engine as well as other vital parts of the motorcycle and can lead to chain slippage or breakage. To prevent this from occurring, keep the drive chain slack within the specified limits.
TIP
Using the alignment marks on each
side of the swingarm, make sure that
both drive chain pullers are in the same
position for proper wheel alignment.
- Tighten the axle nut, then the locknuts to their specified torques.
| Tightening torques: Axle nut: 85 Nm (8.5 m.kgf, 61 ft.lbf) Locknut: 16 Nm (1.6 m.kgf, 11 ft.lbf) |
Changing the brake fluid
Have a Yamaha dealer change the
brake fluid at the intervals specified in
the periodic maintenance and lubrication
chart. In addition, have the brake
hose replaced every four years or
whenev ...
Cleaning and lubricating the drive chain
The drive chain must be cleaned and
lubricated at the intervals specified in
the periodic maintenance and lubrication
chart, otherwise it will quickly wear
out, especially when riding in dusty ...
Other materials:
Checking the swingarm
1. Check:
Swingarm
Bends/cracks/damage
Replace.
2. Check:
Pivot shaft
Roll the pivot shaft on a flat surface.
Bends Replace.
WARNINGDo not attempt to straighten a bent pivot
shaft.
3. Wash:
Pivot shaft
Washer
Swingarm adjusting collar
Du ...
Bleeding the hydraulic brake system
WARNINGBleed the hydraulic brake system whenever:
the system is disassembled.
a brake hose is loosened, disconnected or
replaced.
the brake fluid level is very low.
brake operation is faulty.
NOTE:
Be careful not to spill any brake fluid or allow
th ...
Removing the rear brake caliper
NOTE:
Before disassembling the brake caliper, drain
the brake fluid from the entire brake system.
1. Remove:
Union bolt "1"
Copper washers "2"
Brake hose "3"
NOTE:
Put the end of the brake hose into a container
and pump out the brake fluid carefully. ...