6 MS 440, MS 440 C
3.5 Tightening Torques
DG screws 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 (lbf ft)
Screw IS-M5x20 Crankcase 11.5 (8.48)
Screw IS-M5x20 Cylinder 11.5 (8.48)
Screw IS-M5x16 Muffler, lower casing to cylinder 11.0 (8.11) 1)
Screw IS-M5x6 Muffler, upper casing top 6.5 (4.79) 1)
Screw IS-M5x16 Muffler top 11.0 (8.11) 1)
Screw IS-M5x18 Muffler bottom 15.0 (11.06) 1)
Screw IS-M5x20 Ignition module 7.0 (5.16) 2)3)
Screw IS-M4x16 Shroud 4.0 (2.95)
M12x1 L Carrier (clutch) 50.0 (36.88)
M14x1,25 Spark plug 25.0 (18.44)
Nut M5 Carburetor 3.5 (2.58)
Screw IS-M4x16 Annular buffer plate 5.0 (3.69)
Screw IS-M5x12 Spiked bumper top (with nut) 7.5 (5.53)
Screw IS-M5x16 Spiked bumper bottom (chain catcher) 7.5 (5.53)
Screw IS-M3,5x12 Generator 2.0 (1.48) 1)
Screw M4x8 Cover, chain tensioner 3.0 (2.21)
Screw IS-M4x12 Oil pump 3.5 (2.58)
Screw IS-M4x12 Cover, chain brake 3.0 (2.21)
Screw IS-M4x12 Brake band 3.0 (2.21) 1)
Screw IS-M4x16 Fan housing 4.0 (2.95) 2)
Screw M4x8 Side plate, inner 3.0 (2.21)
Nut M8x1 Crankshaft (flywheel) 33.0 (24.34)
M10x1 Decompression valve 14.0 (10.33)
Collar stud M8x21,5 Bar mounting 23.0 (16.96) 1)
Polymer screw IS-P6x26,5 Annular buffer, top 5.5 (4.06)
Polymer screw IS-P6x19 Annular buffer, bottom 5.5 (4.06)
Polymer screw IS-P6x19 Front handle, top 8.0 (5.90) 4)
Polymer screw IS-P6x19 Front handle, bottom 8.0 (5.90) 4)
Screw assy. IS-M4x16 Hand guard left, fan housing 4.0 (2.95)
Remarks:
1) Secure screw with Loctite 270
2) Secure screw with Loctite 242
3) A washer must be fitted under the screw head
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