Draining The Float Chamber Of The Carburetor; Checking The Float Level - KTM 250 SX 2003 Owner's Handbook Manual

JET NEEDLE RANGE OF ACTION
TYPE RICHER
N3CG
N3CH
N3CW
60°
Part-throttle range
main jet
Operation with partly open throttle valve. This range is only influenced by
jet needle
the jet needle (shape and position). The optimum part-throttle setting is con-
trolled by the idling setting in the lower range and by the main jet in the
upper range. If the engine runs on a four-stroke cycle or with reduced power
when it is accelerated with the throttle partly open, the jet needle must be
jet needle
lowered by one notch. If then the engine pings, especially when accelerating
under full power at maximum engine revs, the jet needle should be raised.
If these faults should occur at the lower end of the part throttle range at a
idle jet
four-stroke running, make the idling range leaner; if the engine pings, adjust
throttle valve
the idling range richer.
air control screw
Full throttle range
idle adjusting screw
Operation with the throttle fully open (flat out). This range is influenced by
the main jet and the jet needle. If the porcelain of the new spark plug is
found to have a very bright or white coating or if the engine rings, after a
short distance of riding flat out, a larger main jet is required. If the porcelain
LEANER
is dark brown or black with soot the main jet must be replaced by a smaller
one.

Draining the float chamber of the carburetor

Following every wet-cleaning procedure, the float chamber of the carbure-
tor should be drained in order to remove any water that may have penetra-
ted into it. Water in the float chamber leads to engine malfunction.
Make sure you do this while the engine is cold. Close the fuel tap, and place
a cloth under the carburetor, which is capable of absorbing the leaking fuel.
Unscrew the plug
together with the gasket, open the fuel tap, and check the float
chamber for leaks.
1
F
UEL IS EASILY FLAMMABLE AND TOXIC
UTMOST CAUTION
MES OR BURNING CIGARETTES
I
MMEDIATELY CLEAN UP ANY FUEL WHICH MAY HAVE BEEN SPILLED
TED WITH FUEL ARE ALSO EASILY FLAMMABLE
SPLASHED INTO YOUR EYES
D
ISPOSE OF THE FUEL PROPERLY

Checking the float level *

Arrange the carburetor diagonally at about 60° so that the spring in the
float needle valve is not pressed together. In this position, the edge of the
float should be parallel with the float chamber sealing surface (see illu-
stration).
C
D
1
and clean it with compressed air. Then, mount the plug
WARNING
. W
HEN HANDLING FUEL
. N
EVER PERFORM ANY WORK ON THE FUEL SYSTEM NEAR OPEN FLA
. A
LWAYS ALLOW THE ENGINE TO COOL OFF FIRST
. I
N CASE YOU INGESTED FUEL OR FUEL
,
CONSULT A DOCTOR IMMEDIATELY
.
33
,
BE SURE TO EXERCISE THE
-
.
. M -
ATERIALS SATURA
.