Replace the spark plugs at specified mileage intervals. See Service Intervals and Records → Service Records.
WARNING
Disconnecting spark plug cable with engine running can result in electric shock and death or serious injury. (00464b)
CAUTION
Do NOT pull on any electrical wires. Pulling on electrical wires may damage the internal conductor causing high resistance, which may result in minor or moderate injury. (00168a)
Refer to Specifications → Specifications → Electrical for spark plug specifications.
  1. Disconnect spark plug cables from plugs by pulling up on the molded connector caps.
  2. Check spark plug type. Only use those spark plugs specified for your model motorcycle.
  3. Check spark plug gap against specifications table.
  4. Always tighten to the proper torque.
  5. Connect each molded connector cap until the cap snaps firmly into place over the spark plug.