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:

    Adjusting the valve clearance
    The following procedure applies to all of the valves. NOTE: Valve clearance adjustment should be made on a cold engine, at room temperature. When the valve clearance is to be measured or adjusted, the piston must be at top dead center (TDC) on the compression stroke. 1. Remove: ...

    Installing the valves
    The following procedure applies to all of the valves and related components. 1. Deburr: Valve stem end (with an oil stone) 2. Lubricate: Valve stem "1" Valve stem seal "2" (with the recommended lubricant) 3. Install: Lower spring seat "1" Valve stem seal "2" V ...

    Checking the cylinder and piston
    1. Check: Piston wall Cylinder wall Vertical scratches Replace the cylinder, and replace the piston and piston rings as a set. 2. Measure: Piston-to-cylinder clearance a. Measure cylinder bore "C" with the cylinder bore gauge. NOTE: Measure cylinder bore "C" by takin ...

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