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15 TUNING THE ENGINE
15.5
15.6
100
Carburetor – idle setting (50 SX Mini)
H00078-10
Carburetor - adjusting the idle speed
S03218-10
The idle setting of the carburetor has a big influence on the start-
ing behavior, stable idle speed, and the response to throttle open-
ing. This means that an engine with a correctly set idle speed will
be easier to start than one with an incorrectly set idle speed.
Info
The carburetor and its components are subject to increased
wear caused by engine vibration. Wear can result in mal-
functioning.
The idle speed is adjusted using the idle speed adjusting
1
screw
.
The idle mixture is adjusted using the idle air adjusting screw
(50 SX)
–
Screw in idle air adjusting screw
the specified basic setting.
Guideline
Idle air adjusting screw
Open
–
Run the engine until warm.
Guideline
Warming-up phase
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 effective exhaust extraction when starting or
running the engine in an enclosed space.
–
Adjust the idle speed using idle speed adjusting screw
Guideline
Choke function deactivated – The choke lever is pushed in
to the stop. (
p. 17)
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.
2
all the way and turn it to
3 turns
≥ 5 min
1
1,400 ... 1,500 rpm
2
slowly in a clockwise direc-
2
.
.
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