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:

    Checking the oil pump
    1. Check: Oil pump drive gear Oil pump driven gear Oil pump housing Oil pump housing cover Cracks/damage/wear Replace the defective part(s). 2. Measure: Inner-rotor-to-outer-rotor-tip clearance "a" Outer-rotor-to-oil-pump-housing clearance "b" - Oil-pump-housing-to-inn ...

    Main switch/steering lock
    Main switch/steering lock The main switch/steering lock controls the ignition and lighting systems, and is used to lock the steering. The various positions are described below. ON All electrical circuits are supplied with power, the meter lighting, taillight, license plate light and ...

    Throttle position sensor
    1. Check: Throttle position sensor a. Connect the digital circuit tester to the terminals of the throttle body sensor assembly coupler as shown. Positive tester probe → gray/red terminal "1" Negative tester probe → gray/black terminal "2" b. Measure the throttle pos ...

    2024 Copyright www.yam-r125.net |