KTM 250 SX-F 2006 Repair Manual

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

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