KTM 450 SX 2009, Owner'S Manual

Page: 157 / 205

MAINTENANCE ON CHASSIS AND ENGINE
155
9.85
Carburetor - idle
300280-10
The idle setting of the carburetor has a big influence on the starting behavior, stable idling
and the response to throttle opening. That means that an engine with a correctly set idle
speed is easier to start than if the idle is set wrongly.
Info
The carburetor and its components are subject to increased wear caused by engine
vibration. Wear can result in malfunctioning.
If the idle speed is set significantly higher, the engine does not start. When the elec-
tric starter button is activated, the electric starter turns over the engine, but the
engine does not start because there is no ignition spark.
The idle speed is adjusted with the adjustment screw

.
The idle mixture is adjusted with the idle mixture adjustment screw

.
9.86
Carburetor - adjusting the idle speed
x
300280-10
–
Screw in idle adjusting screw

until it stops and then to the prescribed basic setting.
Guideline
Idle mixture adjusting screw
Open 1.5 turns
Adjustment tool for mixture control screw (59029034000)
–
Run the engine until warm.
Guideline
Warm-up time
≥
5 min