Oil Circuit; Oil And Screen Filter Change, Bleeding Of The Oil System - KTM 625 SXC Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE
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Oil circuit

The oil pump [1] pumps the motor oil past the bypass valve [2] and through
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the oil filter [3]. Beyond the oil filter, one of the oil lines forks off to a jet [4]
that injects motor oil to the piston pin bearing and the piston head. The sec-
ond oil line leads the main oil flow to the frame breast pipe [5] where the
motor oil is cooled off. Then the motor oil flows through the fine screen filter
[6] that removes even the finest of contaminants from the motor oil. The cleansed
motor oil is pumped via an oil line and the clutch cover into the crankshaft
to the conrod bearing [7] and drains from there into the crank case. A addi-
tional oil pump [8] suctions the motor oil out of the crank case and pumps it
through the oil canal [9] to the gear wheels of the 4th and 5th gears. The
4 motor oil reaches the oil sump via the gear wheels. The timing chain [10] also
dips into the oil sump and propels motor oil upwards to the cylinder head.
The motor oil reaches the carnshaft [11] and the valves through the bore [12].
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Oil and screen filter change, bleeding of the oil system *

Note: The frame breast pipe is integrated into the oil circuit for the sake of
more effectively cooling the motor oil. It is thus important when changing the
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oil to also remove the fine screen filter, to drain the motor oil from the breast
pipe and to de-aerate the oil system.
If the oil system is not bled at all or bled insufficiently, the bearings of the
engine will not get enough lubrication, which in turn may result in engine
failure.
Therefore, we recommend that you have the engine oil changed by your
authorized KTM mechanic. During the guaranty period, the oil change must
be performed by an authorized KTM mechanic. Otherwise, the guarantee will
become void.
The engine oil change is to be carried out when the engine is still warm.
An engine having been run warm, and the engine oil in it is very hot - do not
6 burn yourself.
Place the motorcycle on a horizontal surface. Remove the two plugs [13] and
[14], and drain oil into a container.
Plug A must not be removed, this is part of the by-pass valve.
Remove the screws and the cover [15]. Loosen the fine screen filter [6] with
an oil filter wrench and then screw it off by hand.
The screw [16] must be removed to allow the motor oil to flow out of the frame
breast pipe.
Clean the plugs thoroughly with petroleum and compressed air in order to
remove any metal filings. After the oil has drained completely, clean the seal-
ing areas and remount the plugs together with their gaskets. Tighten plug [13]
with 30 Nm and plug [14] with 20 Nm. Tighten the screw [16] with
10 Nm. Clean sealing surfaces on the frame breast pipe [17], fill new fine
screen filter with engine oil, and oil rubber gasket [18]. Replace fine screen
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filter and screw it back in place, your bare hand will do.
Remove oil dipstick on the clutch cover, fill with 1.3 litre (0.34 US gallons)
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engine oil and attach plug again.
– Use only original KTM fine screen filters. Using another filter brand can
result in damage to the engine.
– If the engine oil has been drained from the front pipe of the frame, you
must bleed the oil system!
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