Working on the vertical head, loosen screws (1), recover washer (2) and remove coil (3).
Use tool no.
88173.2877 to replace the spark plug and tighten the new one to 12 Nm (Min. 11 Nm - Max. 13 Nm).
Position coil (3), washer (2) and tighten screw (1) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm).
Work in the same way on the horizontal head.
Remove the screw (4) and recover washer (5).
Use tool no.
88713.2877 to replace the spark plug and tighten the new one to 12 Nm (Min. 11 Nm - Max. 13 Nm).
Position coil (6), washer (5) and tighten screw (4) to a torque of 10 Nm (Min. 9 Nm - Max. 11 Nm).