KTM 250 SX-F 2005, Repair Manual

Page: 82 / 125

Mounting the camshafts
– Place the intake camshaft in the bearing seat, mark
1
aligned with
the dividing edge
2
between the camshaft bearing bridges, and run
the chain over the camshaft gear such that the chain is tensioned on
the intake side.
NOTE:
– The camshafts are differentiated by the automatic decompressor,
which is mounted on the exhaust camshaft.
– The lock ring on the camshaft ball bearing must engage in the
groove in the camshaft bearing bridge.
– Run the timing chain over the rear sprocket of the exhaust camshaft
and press the exhaust camshaft into the bearing seat.
NOTE:
– The lock ring on the camshaft ball bearing must engage in the
groove in the camshaft bearing bridge.
– If mark
3
on the exhaust camshaft is not positioned over the
dividing edge
2
of the camshaft bearing bridge, lift the exhaust
camshaft out again and turn it accordingly.
– Mount the upper camshaft bearing bridge
4
- do not forget the
needle rollers required for centering.
– Mount the timing chain guide rail
5
with the distance bushings.
– Oil the screws and nuts on the camshaft bearing bridge and tighten
to 18 Nm.
6-13
1
2
3
4
5