TUNING THE ENGINE 16
89
16.4
Carburettor
–
idle speed
402799-11
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
1
.
The idle speed is adjusted with adjusting screw
2
.
16.5
Carburetor
–
adjusting the idle speed
E01402-10
–
Screw in idle air adjusting screw
1
all the way and turn it to the
specified basic setting.
Guideline
Idle air adjusting screw (All 280 models)
open
1 turn
Idle air adjusting screw (All 125/250/300 models)
open
1.25 turns
–
Run the engine until warm.
Guideline
Warming-up phase
≥
5 min
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
2
.
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
900 … 1,100 rpm
–
Turn idle air adjusting screw
1
slowly in a clockwise direction until
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.
