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15
TUNING THE ENGINE
15.3
Carburetor - idle
Carburetor – adjusting the idle speed
15.4
The idle setting of the carburetor has a big influence on the starting behavior, stable
idling and the response to throttle opening. That means that an engine with a correctly
set idle speed is easier to start than if the idle is set wrongly.
Info
The carburetor and its components are subject to increased wear caused by
engine vibration. Wear can result in malfunctioning.
The idle speed is adjusted with adjusting screw
The idle mixture is adjusted with idle adjusting screw
V00222-10
–
Screw in idle air adjusting screw
position.
Guideline
Idle air adjusting screw
Open
–
Run the engine until warm.
Guideline
Warm-up time
V00222-10
–
Connect special tool.
Tachometer (45129075000)
Danger
Danger of poisoning Exhaust gases are toxic and inhaling them may result
in unconsciousness and death.
–
–
–
Adjust the idle speed with adjusting screw
Guideline
Choke function deactivated – The choke lever is pushed up all the way to the
stop. (
Idle speed
–
Turn idle air adjusting screw
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.
Info
If there is a big engine speed rise, reduce the idle speed to a normal level
and repeat the above steps.
If the procedure described here does not lead to satisfactory results, the
cause may be a wrongly dimensioned idling jet.
If you can turn the idle air adjusting screw to the end without any change of
engine speed, mount a smaller idling jet.
After changing the idling jet, start from the beginning with the adjusting
steps.
Following extreme air temperature or altitude changes, adjust the idle speed
again.
2
all the way and turn it to the specified basic
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.
p. 13)
2
slowly in a clockwise direction until the idle speed
1
.
2
.
3.5 turns
≥ 5 min
1
.
1,400... 1,500 rpm
72
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