17 TUNING THE ENGINE
134
(EXC BR)
Height above sea
level
751 … 1,500 m (2,464 … 4,921 ft)
Ambient tempera-
ture
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. 166)
(All XC‑W models)
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. 165)
The idle speed is adjusted with adjusting screw
1
.
The idle mixture is adjusted using the idle air adjusting screw
2
.
17.5 Carburetor – adjusting the idle speed
402799-11
–
Screw idle air adjusting screw
1
all the way in.
– Turn the idle air adjusting screw to the specified basic setting.
Info
The basic setting of the carburetor is specified in the
technical data.
– Run the engine until warm.
Guideline
Warm-up time ≥ 5 min
– Connect special tool.
Tachometer (45129075000)
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. 22)
Idle speed 1,400 … 1,500 rpm