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TECHNICAL DATA – ENGINE
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TIGHTENING TORQUES – ENGINE 250/450 SX-F
Hexagon collar screw, engine case, clutch cover, ignition cover, water pump cover M6
10 Nm
Hexagon collar screw, engine case, clutch case
M7x1
14 Nm
Oil drain plug
M12x1.5
20 Nm
Allen head plug, oil screen short (250 SX-F)
M16x1.5
10 Nm oiled
Hexagon plug, oil screen long (250 SX-F)
M20x1.5
15 Nm
Plug, oil screen (450 SX-F)
M32x1,5
30 Nm oiled
Collar screw for oil filter cover (250 SX-F)
M5
6 Nm
Collar screw for oil filter cover (450 SX-F)
M4
6 Nm
Plug pressure valve
M12x1,5 / M14x1,5
18 Nm
Hexagon collar screw/collar nut cylinder / cylinder head
M6
10 Nm oiled
Cylinder head screw (250 SX-F)
M10
40/50 Nm oiled
Collar nut cylinder head (450 SX-F)
M10x1,25
10 Nm/30 Nm/50°
Hexagon collar screw, exhaust flange
M6
Loctite 243 + 10 Nm
Valve cover screws
M6
10 Nm
Hexagon nut, primary gear (250 SX-F)
M18x1.5 left
Loctite 243 + 150 Nm
Hexagon nut, primary gear (450 SX-F)
M27x1
60 Nm
Nut for inner clutch hub (250 SX-F)
M18x1.5
Loctite 243 + 120 Nm
Nut for inner clutch hub (450 SX-F)
M18x1.5
Loctite 243 + 80 Nm
Hexagon collar screw, clutch spring
M6
10 Nm
Allan head screw, shift roller locking piece
M6
Loctite 243 + 10 Nm
Hexagon collar screw, locking lever
M5
Loctite 243 + 6 Nm
Plug for chain tensioner
M24x1.5
25 Nm
Hexagon collar screw, stator
M5
Loctite 243 + 6 Nm
Hexagon collar screw, pulser coil
M5
Loctite 243 + 6 Nm
Hexagon collar nut, flywheel (250 SX-F)
M12x1
60 Nm
Flywheelscrew (450 SX-F)
M10x1
80 Nm oiled
Cable retaining bracket (ignition)
M6
Loctite 243 + 6 Nm
Allan head screw, kickstarter
M8
Loctite 243 + 25 Nm
Hexagon collar screw, shift lever
M6
Loctite 243 + 10 Nm
Hexagon screw, engine sprocket
M10
Loctite 243 + 60 Nm
Spark plug
M10
10-12 Nm
BASIC CARBURATOR SETTING
250 SX-F
450 SX-F
Type
Keihin FCR-MX 3925E
Keihin FCR-MX 4125F
Main jet
175
185
Jet needle
OBETP
OBDTP
Idling jet
40
40
Main air jet
200
200
Idling air jet
100
100
Needle position
5
th
from top
4
th
from top
Starting jet
85
85
Mixture control screw open
1.25
1.5
Slide
15
15
Performance restrictor
–
–
Stop pump membrane
858 / 2.15 mm
858 / 2.15 mm
Hot start device
2.5 mm
2.5 mm