Carburetor - Adjusting Idle - KTM 525 XC ATV 2008 Owner's Manual

MAINTENANCE ON CHASSIS AND ENGINE

Carburetor - adjusting idle

The idle speed is adjusted with the adjustment screw
The idle mixture is adjusted with the idle mixture adjustment screw
x
Screw in the idle adjusting screw
setting.
Specification
Idle mixture adjusting screw
Open
Adjustment tool for mixture control screw (59029034000)
Run the engine until warm.
Specification
600145-10
Warm-up time
Adjust the idle speed with the adjusting screw
Specification
Choke function deactivated
Idle speed
Info
If the idle speed is set significantly higher, the engine does not start. When
the electric starter button is activated, the electric starter turns over the
engine, but the engine does not start because there is no ignition spark.
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 extremely sporty rider will set the mixture about 1/4 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 fit 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 the adjusting screw
Specification
Choke function deactivated
Idle speed
Info
Following extreme air temperature or altitude changes, adjust the idle speed
again.
.
until it stops and then to the prescribed basic
1.0 turn
5 min
.
The choke lever is pushed in to the stop. (
1,500... 1,600 rpm
slowly until the idle speed begins to fall.
.
The choke lever is pushed in to the stop. (
1,500... 1,600 rpm
71
.
P. 17)
P. 17)