Emptying The Carburetor Float Chamber - KTM 250 XCF-W USA 2010 Owner's Manual

MAINTENANCE WORK ON CHASSIS AND ENGINE

Emptying the carburetor float chamber

11.110
Danger
Fire hazard Fuel can highly flammable.
–
Never fill up the vehicle near open flames or burning cigarettes, and always switch off the engine first. Be careful that no
fuel is spilt, especially on hot vehicle components. Clean up spilt fuel immediately.
–
Fuel in the fuel tank expands when warm and can escape if the tank is overfilled. See specifications on filling up with fuel.
Guideline
Warm-up time
Danger
Danger of poisoning Exhaust gases are poisonous and can result in uncon-
sciousness and/or death.
–
When running the engine, always make sure there is sufficient venti-
lation, and do not start or run the engine in a closed space without an
effective exhaust extraction system.
–
Adjust the idle speed with adjusting screw
Guideline
Choke function deactivated – The choke lever is pushed in to the stop.
(250 XCF‑W USA) (
Choke function deactivated – The choke lever is pushed back to the stop.
(250 EXC-F EU) ( p. 20)
Idle speed
–
Turn the idle adjusting screw
–
Note the position and turn the idle adjusting screw slowly counterclockwise until
the idle speed falls.
–
Adjust to the point between these two positions with the highest idle speed.
Info
If there is a big engine speed rise, reduce the idle speed to a normal level
and repeat the above steps.
The extreme sport motorcyclist will set the mixture about ¼ of a turn back
from this ideal value (leaner, in a clockwise direction) since the engine
becomes hotter in sporting use.
If the procedure described here does not lead to satisfactory results, the
cause may be a wrongly dimensioned idling jet.
If you can turn the idle adjusting screw to the end without any change of
engine speed, you have to mount a smaller idling jet.
The idle adjusting screw must not be opened more than two turns. If more
than two turns are necessary (rich mixture), use a larger idling jet.
After changing the idling jet, start from the beginning with the adjusting
steps.
–
Adjust the idle speed with adjusting screw
Guideline
Choke function deactivated – The choke lever is pushed in to the stop.
(250 XCF‑W USA) (
Choke function deactivated – The choke lever is pushed back to the stop.
(250 EXC-F EU) ( p. 20)
Idle speed
Info
Following extreme air temperature or altitude changes, adjust the idle speed
again.
x
≥ 5 min
.

p. 21)
1,400... 1,500 rpm
slowly until the idle speed begins to fall.

.

p. 21)
1,400... 1,500 rpm
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