KTM 250 SX-F 2005, Repair Manual

Page: 76 / 125

6-7
Mounting the primary pinion and the chain drive
– Move the crankshaft into the TDC position and lock in place with the
locking screw (20 Nm).
– Mount the woodruff key (if previously removed).
– Mount the primary gear, detent edged lock washer and nut (+
Loctite 243, A/F 27, LH thread). Tighten the nut to 150 Nm.
– Mount the timing chain tensioning rail
1
and the chain securing
guide
2
. Apply Loctite 243 to the screws and tighten to 10 Nm.
NOTE:
– Make sure you only apply Loctite 243 to the screw thread otherwise
the timing chain tensioning rail will block and can break.
– The chain securing guide must rest against the stop
A
.
– Slip on the timing chain. Pay attention to the running direction if
using a used chain.
– Place the stop disk
3
on the bearing
4
of the timing train idler
shaft
5
.
– Position the timing train idler
6
on the bearing and align the marks
M
with the primary gear.
– Slide in the timing train idler shaft with the woodruff key
7
.
1
2
A
M
6
5
7
3
4
7