KTM 450 SX-F Repair Manual page 108

8-11
0.9 mm
Checking/adjusting the float height
– Tilt the carburetor until the float rests against the float needle valve
without compressing it.
– The edge of the float should be parallel to the sealing area of the
float chamber in this position (see photo).
– If the float height does not correspond to the setpoint value, check
the float needle valve and replace if necessary.
– If the float needle valve is good you can adjust the float height by
bending the float tab
1
Checking/adjusting the throttle slide opening
NOTE: the basic 1 mm throttle slide setting only helps to control the
beginning of injection by the accelerator pump and the basic setting of
the throttle sensor.
– Use the adjusting screw
1 mm. This test is easily performed with a 1 mm drill bit shaft or
2
wire.
1mm
Checking/adjusting the operation of the accelerator pump
NOTE: adjusting the accelerator pump clearance will change the
beginning of injection and will not affect the quantity injected or
intensity of the accelerator pump.
– A 1mm opening of the throttle slide is a prerequisite for the correct
adjustment of the accelerator pump operation.
– The basic setting for the accelerator pump piston rod projection is
0.9 mm.
– The piston rod projection can be corrected by turning the adjusting
screw
NOTE: check and/or adjust the idling speed.
3
.
1
to set the opening of the throttle slide to
2
.
3