1. Disconnect the ground cable from battery.
2. Remove the air cleaner case. 
3. Disconnect the connector from ignition coil.
4. Remove the ignition coil.
NOTE:
Turn #3 ignition coil by 180 degrees to remove it.
5. Remove the spark plug with a spark plug socket.
6. Install in the reverse order of removal.
Tightening torque (Spark plug):
21 N·m (2.1 kgf-m, 15.5 ft-lb)
Tightening torque (Ignition coil):
16 N·m (1.6 kgf-m, 11.8 ft-lb)
1. Remove the battery and battery carrier.
2. Disconnect the connector from ignition coil.
3. Remove the ignition coil.
NOTE:
Turn #4 ignition coil by 180 degrees to remove it.
4. Remove the spark plug with a spark plug socket.
5. Install in the reverse order of removal.
Tightening torque (Spark plug):
21 N·m (2.1 kgf-m, 15.5 ft-lb)
Tightening torque (Ignition coil):
16 N·m (1.6 kgf-m, 11.8 ft-lb)