15 TUNING THE ENGINE
98
402674-01
Column
2
corresponds to a needle in the standard position.
Column
1
corresponds to a needle which is half a clip leaner.
Column
3
corresponds to a needle which is half a clip richer.
Column
4
specifies the diameter of the first cylindrical part of the needle. The smaller the diameter of the first cylindrical
part of the needle, the richer the mixture preparation. The larger the diameter of the first cylindrical part of the needle, the
leaner the mixture preparation. The first cylindrical part of the needle has the greatest influence in the lowest load range.
Info
The top right jet needle
A3
corresponds to the richest setting of the carburetor, and the bottom left jet needle
F1
corresponds to the leanest. The optimal carburetor tuning is shown under the respective model.
B00075-10
Clip position
1... 5
Clip position from above
The five possible clip positions are shown here.
The carburetor tuning depends on the defined ambient and operating
conditions.
15.4
Carburetor
–
idle setting
402799-10
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. 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 malfunc-
tioning.
The factory setting for the carburetor is set for the following values.
Height above sea level
301 … 750 m (988 … 2,461 ft)
Ambient temperature
16 … 24 °C (61 … 75 °F)
Super unleaded (98 octane) mixed with 2-stroke engine oil (1:40)
(
The idle speed is adjusted with adjusting screw
1
.
The idle mixture is adjusted using the idle air adjusting screw
2
.
