Motorcycle Mechanic how-to

How to Adjust a Motorcycle Drive Chain

Correct chain slack protects the chain, sprockets and transmission.

Updated By the Career Education Institute Curriculum Team
Quick answer

Correct chain slack protects the chain, sprockets and transmission. In short: place; find; measure, then complete the remaining steps below.

Step by step

  1. Place the bike on a stand as the manual specifies.

  2. Find the tightest spot by rotating the wheel.

  3. Measure slack at the midpoint of the lower run.

  4. Loosen the axle nut and adjust both adjusters equally.

  5. Check wheel alignment marks on both sides.

  6. Torque the axle nut, recheck slack and lubricate the chain.

Safety reminders for motorcycle mechanics

  • Secure bikes on stands and lifts before working
  • Wear full riding gear for test rides
  • Torque critical fasteners and double-check brakes before rides
  • Handle fuel and solvents in ventilated areas

Valve clearance · Chain slack · Final drive · Fork seals · Sag · EFI: see the full motorcycle mechanic glossary.

More motorcycle mechanic how-to guides

Learn this in Motorcycle Mechanic trainingTake the practice test
Enroll in trainingTake fit quiz