How to Change the Sprockets on a Motorcycle

Written by chris gilliland Google
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Most motorcycles rely on a simple chain and sprocket system to create forward motion. The drive sprocket attached to the motor's countershaft pulls the drive chain that wraps around the rear driven sprocket, effectively turning the rear wheel to propel the motorcycle forward. Over time, the chain begins to wear down the sprockets' teeth, making the sprockets increasingly difficult to turn. Basic tools can be used to replace either sprocket, but the job requires a rear stand and a firm knowledge of how to remove your motorcycle's rear wheel and foot rests.

Skill level:
Moderate

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Things you need

  • Socket wrench and sockets
  • Rear stand
  • Combination wrench set
  • Wood blocks
  • Sprockets
  • Threadlocking adhesive

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Instructions

    Rear Sprocket

  1. 1

    Use a socket wrench to loosen the rear axle nut on the motorcycle's swingarm.

  2. 2

    Lift the rear wheel off of the ground, using a rear stand or the motorcycle's centre stand. Unscrew the rear axle nut completely, using a socket wrench.

  3. 3

    Use a combination wrench to loosen the chain adjustment bolts locknuts on both sides of the swingarm. Turn the adjustment bolts counterclockwise with a combination wrench to loosen the chain.

  4. 4

    Lift the chain off the rear sprocket and pull it to the side. Remove the rear axle from the wheel and swingarm to drop the wheel to the ground.

  5. 5

    Set the wheel on a pair of wood blocks for support, facing the sprocket side up. Use a socket wrench to unscrew the rear sprockets bolts and pull the sprocket off the rear wheel.

  6. 6

    Lay a new sprocket onto the rear wheel. Coat the sprocket bolts with threadlocking adhesive and insert them into the rear wheel and sprocket. Use a socket wrench to tighten the sprocket bolts.

  7. 7

    Follow the reverse method of removal to reinstall the rear wheel onto the motorcycle.

    Front Sprocket

  1. 1

    Use a socket wrench to loosen the rear axle nut.

  2. 2

    Use a combination wrench to loosen the chain adjustment bolts locknuts on both sides of the swingarm. Turn the adjustment bolts counterclockwise with a combination wrench to loosen the chain.

  3. 3

    Remove the left foot rest and shift lever, if needed, using a socket wrench.

  4. 4

    Use a socket wrench to unscrew the bolts from the front sprocket's cover, then pull the cover off the motor.

  5. 5

    Lift the chain off the front sprocket and set it aside. Use a socket wrench to unscrew the front sprocket's retaining nut.

  6. 6

    Pull the sprocket off the motor's countershaft and replace it with a new sprocket. Pull the chain over the sprocket.

  7. 7

    Use a socket wrench to screw the sprocket's retaining nut in place. Reinstall the sprocket cover, foot rest and shift lever, using a socket wrench.

  8. 8

    Tighten the chain, using a combination wrench to turn the adjustment bolts clockwise. Tighten the rear axle locknut with a socket wrench.

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