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:

    Installing the exhaust assembly
    1. Install: Exhaust assembly "1" Exhaust pipe nuts "2" Exhaust assembly bolts "3" "4" NOTE: Do not fully tighten the nuts and bolts. 2. Tighten: Exhaust pipe nuts "2" Exhaust assembly bolt "4" Exhaust assembly bolt "3" ...

    Checking the piston rings
    1. Measure: Piston ring side clearance Out of specification Replace the piston and piston rings as a set. NOTE: Before measuring the piston ring side clearance, eliminate any carbon deposits from the piston ring grooves and piston rings. 2. Install: Piston ring (into the cylind ...

    Checking the relays
    Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, replace the relay. 1. Disconnect the relay from the wire harness. 2. Connect the pocket tester ( × 1) and battery (12 V) to the relay terminal as shown. Check the relay operation. Out ...

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