16 TUNING THE ENGINE
114
(250 XC US)
Height above sea
level
0 … 300 m (0 … 984 ft)
Ambient tempera-
ture
6 … 15 °C (43 … 59 °F)
Super unleaded (95 octane) mixed with 2-stroke engine oil
(1:60) ( p. 148)
(300 XC US)
Height above sea
level
301 … 750 m (988 … 2,461 ft)
Ambient tempera-
ture
16 … 24 °C (61 … 75 °F)
Super unleaded (95 octane) mixed with 2-stroke engine oil
(1:60) ( p. 148)
The idle speed is adjusted with adjusting screw
1
.
The idle mixture is adjusted using the idle air adjusting screw
2
.
16.5 Carburetor – adjusting the idle speed
402799-11
–
Screw in idle air adjusting screw
1
all the way and turn it to
the specified basic position.
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 inhal-
ing 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
2
.
Guideline
Choke function deactivated – The choke lever is pushed in
to the stop. ( p. 20)
Idle speed 1,400 … 1,500 rpm
–
Turn idle air adjusting screw
1
slowly in a clockwise direc-
tion 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 high-
est idle speed.
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