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:

    Installing the engine
    1. Install: Engine "1" Engine mounting bolt (rear lower side) "2" Engine mounting nut (rear lower side) "3" Engine mounting bolt (rear upper side) "4" Engine mounting nut (rear upper side) "5" Engine mounting bolt (front side) "6" Engine mounting nut (front side) "7" NOTE: Do not ...

    Checking the crankshaft
    1. Measure: Crankshaft runout Out of specification Replace the crankshaft, bearing or both. NOTE: Turn the crankshaft slowly. 2. Measure: Big end side clearance Out of specification Replace the crankshaft. 3. Measure: Crankshaft width Out of specification&nbs ...

    Introduction
    WARNINGDisc brake components rarely require disassembly. Therefore, always follow these preventive measures: Never disassemble brake components unless absolutely necessary. If any connection on the hydraulic brake system is disconnected, the entire brake sy ...

    2020 Copyright www.yam-r125.net |