KTM 250 SX - Manual (Page 60)

Mount primary drive and clutch
– Grease crankshaft seal ring.
– Put the oiled O-ring (25x1.50 mm) onto the crankshaft and mount the
distance bushing with the chamfer facing the crank web.
– Insert woodruff key into crankshaft.
– Place primary gear
1 onto crankshaft with collar downwards.
– Put the inner ring onto the main shaft with the collar facing
downwards, then mount the oiled needle cage 2 .
– Mount outer clutch hub and stop disc 3 .
– Apply Loctite 243 to the thread of the main shaft.
– Mount inner clutch hub, new lock washer and hexagon nut to main
shaft.
– Position clutch holder 4 and tighten hexagon nut with 100 Nm
(74 ft.lb.).
– Remove the clutch holder and secure the hexagon nut by bending
both brackets of the lock washer upwards.
– Apply Loctite 243 to thread of the crankshaft.
– Fit locking washer and hexagon nut (left hand thread) by hand.
– Block primary drive with gear segment
5 and tighten primary gear
hexagon nut with 150 Nm (110 ft.lb.).
– Remove gear segment and check easy running of primary drive by
turning crankshaft.
6-5C
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4
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