Activating The Ignition Curve For Low-Octane Fuel; Draining The Float Chamber Of The Carburetor; Carburetor - Adjust Idling - KTM 625 SXC Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE
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Activating the ignition curve for low-octane fuel (SMC)
If you are traveling to a country where fuel having at least 95 octane (ROZ)
is not available, you can easily activate the corresponding ignition curve.
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A socket connector [1] is located on a brown-black cable near the digital box.
If the two connectors are connected to each other, the ignition curve for fuel
having at least 95 octane (ROZ) is activated.
If you disconnect the plug and socket connection, the ignition curve for fuel
having 80 - 94 octane (ROZ) is activated. Although this causes the engine to
lose some of its power output, it prevents poor glow ignitions and engine
damage.
If fuel having at least 95 octane (roz) is not available, the ignition curve for
80 - 94 octane (roz) must be activated to prevent engine damage.

Draining the float chamber of the carburetor

Following every wet cleaning procedure, the float chamber of the carburetor
should be drained in order to remove any water that may have penetrated into
it. Water in the float chamber causes malfunctioning. Perform this task on a
cold engine.
Close the fuel tap and put one end of the hose [2] into a collecting vessel.
Open the drain plug [3] (turning it counterclockwise) by serval turns, and drain
the fuel from the float chamber.
Then, retighten the drain plug and open the fuel tap.
– Fuel is easily flammable and toxic. When handling fuel, be sure to exer-
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cise the utmost caution. Never perform any work on the fuel system in the
proximity of open flames or burning cigarettes.
– Always allow the engine to cool off first. Immediately clean up any fuel
which may have been spilled. Materials saturated with fuel are also eas-
ily flammable. In case you ingested fuel or fuel splashed into your eyes,
consult a doctor immediately.
– Dispose the fuel properly!
CARBURETOR – Adjust idling *
Idling adjustment of the carburetor strongly affects the engine's starting
behavior. That is, an engine whose idling speed is adjusted correctly will be
easier to start than one whose idling speed has not been adjusted correctly.
The idle speed is controlled by means of the adjusting wheel [4] and the mix-
ture control screw [5]. The adjusting wheel is used to adjust the basic setting
of the slide. The mixture control screw is used to control the idle mixture which
arrives at the engine by way of the idle system. Clockwise turning reduces the
fuel quantity (lean mixture), counterclockwise turning increases the fuel quan-
tity (rich mixture).
To adjust idling correctly, proceed as follows:
1 Turn in mixture control screw [5] up to the stop, and turn it back out to
the basic position (see technical date-engine)
2 Warm up the engine
3 Use the adjusting wheel [4] to set the normal idle speed (1400 - 1500 rpm).
4 Turn mixture control screw [5] slowly clockwise until idling speed starts
to decrease. Memorize this position, and turn mixture control screw slowly
counterclockwise until the idling speed decreases again. Adjust the point
of the highest idling speed between these two positions. If, in the course
of this procedure, the speed undergoes a relatively high increase, reduce
the idle speed to a normal level and repeat the procedure specified in 4.
Serious competitive racers will choose a setting approx. 1/4 turn (clock-
wise) leaner than this ideal value because their engine will heat up more
when used in competitions.
NOTE: If you fail to obtain a satisfying result by following the procedure
described above, an incorrectly dimensioned idling nozzle may be the cause.
If:
a) the mixture control screw has been screwed in up to the stop without
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causing any change in rotational speed, a smaller idling jet has to be
installed.
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