Operation Manual

17 TUNING THE ENGINE 106
17.4 Carburetor - idle
E00370-10
The idle setting of the carburetor has a big influence on the starting behavior, stable
idling, and the response to throttle opening. This means that an engine with a correctly
set idle speed is easier to start than if the idle speed is set wrongly.
Info
The carburetor and its components are subject to increased wear caused by
engine vibration. Wear can result in malfunctioning.
The factory setting for the carburetor is set for the following values.
(EXC EU/AU, EXC EU, EXC Six Days EU)
Height above sea level 301… 750 m (988… 2,461 ft)
Ambient temperature 16… 24 °C (61… 75 °F)
Super unleaded (95 octane) mixed with 2-stroke engine oil (1:60) ( p. 142)
(300 EXC BR)
Height above sea level 751… 1,500 m (2,464… 4,921 ft)
Ambient temperature 16… 24 °C (61… 75 °F)
Super unleaded, type C (ROZ 95/RON 95/PON 91 mixed with 2-stroke engine
oil, 1:60) ( p. 142)
(All XC‑W/XC‑W Six Days models)
Height above sea level 0… 300 m (0… 984 ft)
Ambient temperature 16… 24 °C (61… 75 °F)
Super unleaded (95 octane) mixed with 2-stroke engine oil (1:60) ( p. 142)
The idle speed is adjusted with adjusting screw

.
The idle mixture is adjusted using the idle air adjusting screw

.
17.5 Carburetor – adjusting the idle speed
E00370-11
–
Screw idle air adjusting screw

all the way in.
– Turn the idle air adjusting screw to the specified basic setting.
Info
The basic adjustment is shown under the respective model.
– Run the engine until warm.
Guideline
Warm-up time ≥ 5 min
Danger
Danger of poisoning Exhaust gases are toxic and inhaling them may result
in unconsciousness and death.
– Always make sure there is sufficient ventilation when running the
engine.
– Use an effective exhaust extraction system when starting or running the
engine in an enclosed space.
–
Adjust the idle speed with adjusting screw

.
Guideline
Choke function deactivated – The choke lever is pushed in to the stop. ( p. 17)
Idle speed 1,400… 1,500 rpm
–
Turn idle air adjusting screw

slowly in a clockwise direction until the idle speed
begins to fall.
– Note the position and turn the idle air adjusting screw slowly counterclockwise until
the idle speed again begins to fall.
– Adjust to the point between these two positions with the highest idle speed.