KTM 250 SX-F 2005, Repair Manual

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– Remove the outer clutch hub with the needle bearing and inner ring.
Removing the chain drive and primary gear
– Push the timing chain towards the rear sprocket
1
and pull the rear
sprocket off the timing train idler shaft.
– Pull the timing train idler shaft
2
out of the bearing seat together
with the stop disk and remove the woodruff key
3
.
– Slip off the timing chain.
NOTE: mark the running direction if you plan to use the timing chain
again.
– Remove the timing chain tensioning rail and the chain securing
guide.
– Loosen the nut on the primary pinion (A/F 27, LH thread) and
remove together with the detent edged lock washer.
– Remove the primary gear.
NOTE: if you cannot remove the primary gear by hand, use a suitable
extractor with a protector for the crankshaft.
– Remove the crankshaft locking screw.
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