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16 TUNING THE ENGINE
16.5
114
Carburetor – adjusting the idle speed
402799-11
(250 XC US)
Height above sea
0 ... 300 m (0 ... 984 ft)
level
Ambient tempera-
6 ... 15 °C (43 ... 59 °F)
ture
Super unleaded (95 octane) mixed with 2-stroke engine oil
(1:60) (
p. 148)
(300 XC US)
Height above sea
301 ... 750 m (988 ... 2,461 ft)
level
Ambient tempera-
16 ... 24 °C (61 ... 75 °F)
ture
Super unleaded (95 octane) mixed with 2-stroke engine oil
(1:60) (
p. 148)
The idle speed is adjusted with adjusting screw
The idle mixture is adjusted using the idle air adjusting screw
–
Screw in idle air adjusting screw
the specified basic position.
Info
The basic adjustment is shown under the respective
model.
–
Run the engine until warm.
Guideline
Warm-up time
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
Guideline
Choke function deactivated – The choke lever is pushed in
to the stop. (
p. 20)
Idle speed
–
Turn idle air adjusting screw
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.
1
.
1
all the way and turn it to
≥ 5 min
2
.
1,400 ... 1,500 rpm
1
slowly in a clockwise direc-
2
.
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