Yamaha YZF-R125 Service Manual: Installing the drive chain

Yamaha YZF-R125 Service Manual / Chassis / Chain drive / 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 chain rotation.
  • Never install a new drive chain onto worn drive chain sprockets; this will dramatically shorten the drive chain's life.

NOTE:

Install the master link plate with its manufacturer mark facing outward.

Installing the drive chain


4. Install:

  • Drive sprocket cover

NOTE:

Be sure not to pinch the neutral switch lead when installing the drive sprocket cover.

5. Install:

  • Rear wheel Refer to "REAR WHEEL" on page 4-12.

6. Adjust:

  • Drive chain slack Refer to "ADJUSTING THE DRIVE CHAIN SLACK" on page 3-21.

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.

    Checking the drive sprocket
    1. Check: Drive sprocket More than 1/4 tooth "a" wear Replace the drive chain sprockets as a set. Bent teeth Replace the drive chain sprockets as a set. b. Correct 1. Dri ...

    Engine
    ...

    Other materials:

    Checking the cylinder head breather hose
    1. Remove: Left side panel Refer to "GENERAL CHASSIS" on page 4-1. 2. Check: Cylinder head breather hose "1" Cracks/damage → Replace. Loose connection → Connect properly. CAUTION:Make sure the cylinder head breather hose is routed correctly. ...

    Sidestand
    The sidestand is located on the left side of the frame. Raise the sidestand or lower it with your foot while holding the vehicle upright. TIP The built-in sidestand switch is part of the ignition circuit cut-off system, which cuts the ignition in certain situations. WARNING The vehicl ...

    Assembling the rear brake caliper
    WARNING Before installation, all internal brake components should be cleaned and lubricated with clean or new brake fluid. Never use solvents on internal brake components as they will cause the brake caliper piston dust seal and piston seal to swell and distort. ...

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