KTM 250 SX-F 2007 User Manual

8-5
– Turn the carburetor around, remove the 3 screws and remove the
cover of the accelerator pump.
NOTE: When dismounting the cover, watch out for the spring and the
sealing rings as they may get lost easily.
– Remove the 2 sealing rings, the spring and the diaphragm from the
pump housing.
– Remove the screws on the float chamber and remove the housing.
– Pull out the float hinge pin
1 and remove the float together with the
float needle valve.
– Remove the main jet
2.
– Remove the screw
3 and use pliers to carefully extract the seat of
the float needle valve from the carburetor.
– Screw out the idling jet
4, the starting jet 5 and the needle jet 6.
– Turn in the mixture control screw
7 down to the stop, count the
number of turns and write it down.
– Turn out the mixture control screw and dismount it together with the
spring, the washer, and the O-ring.
NOTE: The spring, the washer, and the O-ring will usually remain in the
bore. These parts can be removed with the help of compressed air.
1
2
4
3
5
7
6

KTM 250 SX-F 2007 Specifications

General

Engine Type	Single cylinder, 4-stroke
Displacement	249.5 cc
Compression Ratio	12.8:1
Ignition	Kokusan digital CDI
Starter	Kickstarter
Transmission	5-speed
Lubrication	Pressure lubrication with 2 Eaton pumps
Primary Drive	24:73
Final Drive	13:50
Clutch	Wet multi-disc clutch, hydraulically operated
Bore x Stroke	76 mm x 54.8 mm
Fuel System	Keihin MX FCR 39 carburetor