Stihl MS 650

7MS 650, MS 660
Fastener Thread size For component Torque Remarks
Nm
Screw IS-M5x20 Fan housing, magnesium 7.0
M12x1 L Clutch carrier 70.0 3)
Screw IS-M4x12 Oil pump 3.0 2)
Screw P6x19 Annular buffer 6.0
Screw IS-M5x16 Annular buffer/tank housing, top right 7.0 1)
Screw IS-M5x12 Annular buffer plate 9.0 1)
Screw IS-M5x20 Wrap-around handle with bracket 7.0
Screw M5x 6 Muffler, bottom 6.5 1)
Screw IS-M6x20 Muffler, bottom/crankcase 15.0 1)
Screw M5x16 Muffler/cylinder 11.5 1)
Screw P4x10 Guard/tank housing 2.0
M10x1 Flywheel 45.0 4)
Screw IS-M4x10 Segment/fan housing 2.5
Screw IS-M4x8 Inner side plate 3.0
Nut M5 Carburetor 3.5
M14x1.25 Spark plug 25.0
Screw M5x20 Ignition module 8.0
Screw M6x25 Cylinder/crankcase,
0.5 mm gasket
15.0
Screw M6x25 Cylinder/crankcase,
1 mm gasket
15.0
Remarks:
1) Loctite 243, medium strength
2) Install with Hylomar sealant (0783 810 1101)
3) Left-hand thread
4) Degrease crankshaft/flywheel faces and install dry
Use the following procedure when refitting a DG or P screw in an existing thread:
Place the screw in the hole and rotate it counterclockwise until it drops slightly. Tighten the screw clockwise to
the specified torque.
This procedure ensures that the screw engages properly in the existing thread and does not form a new thread
and weaken the assembly.
Power screwdriver setting for polymer: DG and P screws max. 500 rpm
Do not use an impact screwdriver for releasing or tightening screwed assemblies.
Do not mix up screws with and without binding heads.