Engine Oil; Checking The Engine Oil Level; Oil Circuit - KTM ENDURO 640 LC4 Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE
JASO T903 MA
TEMPERATUR
5W/40
B
A
42
5
10
7
6
8
1
2
9
0°C
32°F
10W/50
11
12
4
3

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)

Checking the engine oil level

The engine oil level can be checked when the engine is cold or warm.
To check, place the motorcycle in an upright position on a level surface (cen-
ter stand).
If the engine is cold, the oil level should be visible at the lower edge [A] of
the inspection glass.
If the engine is warm, the oil level should be visible at the upper edge [B] of
the inspection glass.
Add engine oil if necessary.
– INSUFFICIENT AMOUNTS OF OR LOW-GRADE ENGINE OIL LEAD TO PREMA-
TURE WEAR IN THE ENGINE.
– DO NOT OVERFILL THE ENGINE CASE.
– DO NOT UNDERFILL THE ENGINE CASE.

Oil circuit

The oil pump [1] pumps the motor oil past the bypass valve [2] and through
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
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].
»