KTM 250 SX-F 2005, Repair Manual

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2-3
Oil circuit
Oil circuit
The oil pump
1
draws the engine oil from the transmission oil sump through the long oil screen
2
and conveys it to the oil filter
3
, where any contamination is filtered out. The cleansed engine oil is pumped past the bypass valve
4
through the hole in the
crankshaft
5
to the conrod bearing
6
and sprayed onto the piston
8
from below through a jet
7
.
Two other oil ducts lead into the cylinder head. One duct supplies the hydraulic chain tensioner
9
, the other duct leads to the
camshaft bearing bridge
bk
, where the camshaft bearings and the cam lever are supplied with oil (via spraying nozzles).
The second oil pump
bl
draws the engine oil out of the crankcase through the short oil screen
bm
and uses it to grease the
transmission gears
bn
.
1
3
4
5
6
7
8
9
bk
bl
bm
bn
2