Vittorazi Motors Moster 185 Plus Maintenance Manual page 76

Screw the piston block into the spark plug hole.
Insert the ring gear (9) on the toothed pulley (6), the 4 screws M4x16 (8) and tighten with the
torque shown in the figure.
Insert the 4 nuts M4 (10).
Replace the 4 screws M4x16 each time the ring gear is disassembled
4,1 Nm
Moster 185 Plus - Maintenance manual - V1 76