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Draining The Float Chamber Of The Carburetor; Checking The Float Level - KTM 300SX Owner's Handbook Manual

Ktm motorcycle user manual
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JET NEEDLE
RANGE OF ACTION
TYPE
RICHER
NOZD
NOZE
NOZF
NOZG
NOZH
60°
Opening up
main jet
Engine behavior when the throttle opens. The idle jet and the shape of the
jet needle
throttle valve influences this range. If, despite good idling-speed and part-
throttle setting, the engine sputters and smokes when the throttle is fully
opened and develops its full power not smoothly but suddenly at high
engine speeds, the mixture to the carburetor will be too rich, the fuel level
jet needle
too high or the float needle is leaking.
Part-throttle range
idle jet
Operation with partly open throttle valve. This range is only influenced by
throttle valve
the jet needle (shape and position). The optimum part-throttle setting is
air control screw
controlled by the idling setting in the lower range and by the main jet in the
idle adjusting screw
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 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.
LEANER
If these faults should occur at the lower end of the part throttle range at a
four-stroke running, make the idling range leaner; if the engine pings,
adjust the idling range richer.
Full throttle range
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 porce-
lain 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
1
plug together with the gasket, open the fuel tap, and check the float
chamber for leaks.
F
UEL IS EASILY FLAMMABLE AND TOXIC
THE UTMOST CAUTION
FLAMES 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
illustration).
B
C
D
1
and clean it with compressed air. Then, mount the
WARNING
. W
HEN HANDLING FUEL
. N
EVER PERFORM ANY WORK ON THE FUEL SYSTEM NEAR OPEN
. A
LWAYS ALLOW THE ENGINE TO COOL OFF FIRST
. I
N CASE YOU INGESTED FUEL OR FUEL
,
CONSULT A DOCTOR IMMEDIATELY
.
43
,
BE SURE TO EXERCISE
.
. M
-
ATERIALS SATURA
.

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