KTM 250 SX-F 2006 Repair Manual

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

KTM 250 SX-F 2006 Specifications

General

Engine Type	Single cylinder, 4-stroke
Displacement	249.5 cc
Compression Ratio	12.8:1
Cooling System	Liquid cooled
Starter	Kickstarter
Transmission	5-speed
Primary Drive	24:73
Final Drive	14:50
Clutch	Wet Multi-Disc Clutch, Hydraulically Operated
Bore x Stroke	76 mm x 54.8 mm
Fuel System	Keihin MX FCR 39 Carburetor
Ignition	Kokusan digital CDI
Lubrication	Pressure lubrication with 2 Eaton pumps