6 MS 650, MS 660
3.5 Tightening Torques
DG and P screws (Plastoform) are used in polymer and light metal components. These screws form a permanent
thread when they are installed for the first time. They can be removed and installed as often as necessary
without impairing the strength of the screwed assembly, providing the specified tightening torque is observed.
For this reason it is essential to use a torque wrench.
Fastener Thread size For component Torque Remarks
Nm
Screw IS-M4x8 Chain tensioner cover plate 3.0
Starter post M8 Starter post in fan housing 12.0
Screw M8x21.5 Collar screw for guide bar 23.0 1)
Screw IS-M4x12 Chain brake cover 3.0
M10x 1 Decompression valve or plug 14
Screw M4x10 Spring housing/fan housing 2.5
Nut M5 Flange on filter base 2.0
Twist lock M5 Filter cover 1.0
Screw IS-M4x12 Generator (for carburetor/handle
heating only)
3.5 1)
Screw IS-P6x21.5 Front handle, top, with stiffener
(not wrap-around handle)
7.0
Screw IS-P6x19 Front handle, top (wrap-around handle) 7.0
Screw IS-P6x19 Front handle, bottom 7.0
Screw IS-P4x19 Handle molding 1.6
Screw IS-M4x 8 Rubber buffer/crankcase 3.5
Screw IS-M5x40x25 Hand guard, left 7.0
Screw IS-M5x16 Shroud/crankcase 7.0
Screw IS-M5 Chain catcher/spiked bumper (with
wrap-around handle)
6.0
Screw IS-M5x20 Chain catcher/spiked bumper/
crankcase
9.0
Screw M5x12 Spiked bumper/crankcase, top with nut 7.5
Screw IS-M5 Chain sprocket cover/spiked bumper 6.0
Screw IS-M5x20 Crankcase/oil tank housing 11.5
Remarks:
1) Loctite 243, medium strength
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