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MAINTENANCE WORK ON CHASSIS AND ENGINE »
Engine oil
Automobile engine oil used to be used for four-stroke motorcycles before there
were separate motorcycle specifications. Different technical developments made
it necessary to have a separate specification for four-stroke motorcycles - the
JASO T903 MA standard. Whereas car engines require long changing inter-
vals, motorcycle engines require a higher power output at higher speeds. Most
motorcycle engines also use the same oil to lubricate the transmission and
the clutch. The JASO MA standard responds to these special requirements.
Only use fully synthetic engine oils that meet the JASO MA quality require-
ments (see information on the can).
KTM recommends Motorex Power Synt 4T in the 10W/50 viscosity (for tem-
peratures over 0°C, 32°F) or 5W/40 (for temperatures under 0°C, 32°F).
INSUFFICIENT OIL OR POOR QUALITY OIL RESULTS IN PREMATURE WEAR OF THE
ENGINE.
Changing the engine oil *
Note: When changing the engine oil, it is necessary to clean the short and
long oil screens and to replace both oil filters (250 SX-F: only one oil filter).
Engine oil has be changed with the engine at an operating temperature.
AN ENGINE AT OPERATING TEMPERATURE AND THE ENGINE OIL IT CONTAINS ARE
VERY HOT – DO NOT BURN OR SCALD YOURSELF.
Place the motorcycle on a horizontal surface, remove the plug [1] and allow
the oil to drain into a receptacle.
Clean plug (with magnet) thoroughly.
Once the entire oil has been drained, clean the sealing surface, mount the
plug together with the sealing ring and tighten it to 20 Nm.
CLEANING THE SHORT OIL SCREEN
The short oil screen [2] is accommodated in the hex-socket plug [3] at the
engine bottom. Insert a pin-type key into the plug and tap on the key a few
times with a hammer in order to relieve the stress acting on the plug. Dismount
the oil screen, clean the components thoroughly and blow compressed air through
them. Check the O-rings for damage and, if necessary, replace them. Mount
the oil screen together with the plug again and tighten the plug to 10 Nm.
CLEANING THE LONG OIL SCREEN
The long oil screen is accommodated in the hexagon plug [4] adjacent to the
engine number. Dismount the plug together with the oil screen, clean the com-
ponents thoroughly and blow compressed air through them. Check the O-rings
for damage and, if necessary, replace them.
To mount the long oil screen [5], place it on an approx. 300 mm (12 in) long
pin-type key or a similar tool. Insert the pin-type key through the opening into
the bore of the opposite engine casing wall. Then, push the oil screen into
the engine casing as far as possible. Remove the pin-type key, mount the plug
and tighten it to 15 Nm.
THE OIL SCREEN IS MOUNTED SLIGHTLY DOWNWARDS, INCORRECTLY FITTED,
THE SCREEN LOOSES ITS FUNCTION AND THIS CAN CAUSE INCREASED ENGINE
WEAR.
1
2
3
4
5
0°C
32°F
10W/50
5W/40
JASO T903 MA
TEMPERATUR