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Carburettor – idle speed
16.4
Carburetor – adjusting the idle speed
16.5
The idle setting of the carburetor significantly influences the vehicle's
starting behavior, the stability of the idle speed, and the vehicle's
response when accelerating. An engine with a correctly set idle speed
will be easier to start than one with an incorrectly set idle speed.
The idle mixture is adjusted using the idle air adjusting screw
The idle speed is adjusted with adjusting screw
402799-11
–
Screw in idle air adjusting screw
specified basic setting.
Guideline
Idle air adjusting screw (All 280 models)
open
Idle air adjusting screw (All 125/250/300 models)
open
–
Run the engine until warm.
E01402-10
Guideline
Warming-up phase
Danger
Danger of poisoning Exhaust gases are toxic and inhaling
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 run-
ning 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. (Option: Not homologized) (
Choke function deactivated – Choke lever in basic position.
(Option: Homologized) (
Idle speed
–
Turn idle air adjusting screw
the idle speed begins to fall.
–
Note the position and turn the idle air adjusting screw slowly coun-
terclockwise until the idle speed again begins to fall.
–
Adjust to the point between these two positions with the highest
idle speed.
TUNING THE ENGINE 16
1
2
.
1
all the way and turn it to the
1 turn
1.25 turns
≥ 5 min
2
.
p. 16)
p. 16)
900 ... 1,100 rpm
1
slowly in a clockwise direction until
.
89
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