Yamaha YZF-R125 Service Manual: Adjusting the drive chain slack

NOTE:

The drive chain slack must be checked at the tightest point on the chain.

CAUTION:

A drive chain that is too tight will overload the engine and other vital parts, and one that is too loose can skip and damage the swingarm or cause an accident. Therefore, keep the drive chain slack within the specified limits.

1. Stand the vehicle on a level surface.

WARNING

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

NOTE:

Both wheels should be on the ground without a rider on the vehicle.

2. Turn the rear wheel several times and find the tightest position on the drive chain.

3. Check:

  • Drive chain slack "a" Out of specification Adjust.

Adjusting the drive chain slack


NOTE:

Measure the drive chain slack halfway between the drive axle and the rear wheel axle.

4. Adjust:

  • Drive chain slack

a. Loosen the wheel axle nut "1".

b. Loosen both locknuts "2".

c. Turn both adjusting bolts "3" in direction "a" or "b" until the specified drive chain slack is obtained.


Adjusting the drive chain slack


NOTE:

  • To maintain the proper wheel alignment, adjust both sides evenly
  • Push the rear wheel forward to make sure there is no clearance between the drive chain pullers and the ends of the adjusting bolts.

d. Tighten the wheel axle nut to specification.


e. Tighten the locknuts to specification.


    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. brak ...

    Lubricating the drive chain
    The drive chain consists of many interacting parts. If the drive chain is not maintained properly, it will wear out quickly. Therefore, the drive chain should be serviced, especially when the vehi ...

    Other materials:

    Replacing the fuses
    Replacing the fuses Fuse box Spare fuse Headlight fuse Signaling system fuse Ignition fuse Radiator fan fuse Main fuse The fuse box is located under the rider seat. If a fuse is blown, replace it as follows. Turn the key to "OFF" and turn off the electrical circuit i ...

    Checking the camshaft
    1. Check: Camshaft lobes Blue discoloration/pitting/scratches  Replace the camshaft. 2. Measure: Camshaft lobe dimensions "a" and "b" Out of specification Replace the camshaft. 3. Check: Camshaft oil passage Obstruction Blow out with compressed air. ...

    Installing the drive chain
    1. Lubricate: Drive chain Master link 2. Install: Drive sprocket Drive sprocket retainer bolts 3. Install: Master link O-rings Master link plate Master link clip "1" CAUTION: The closed end of the master link clip must face in the direction of drive ch ...

    2019 Copyright www.yam-r125.net |