TUNING THE ENGINE 15
101
402797-01
Column 2 corresponds to a needle in the standard position.
Column 1 corresponds to a needle which is half a clip leaner.
Column 3 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. The larger the diameter of the first cylindrical part of the
needle, the leaner the mixture. The first cylindrical part of the needle has the greatest influence in the lowest
load range.
Info
The top right jet needle A2 corresponds to the richest setting of the carburetor, and the bottom left jet
needle E1 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 operat-
ing conditions.
15.4 Carburetor – idle setting
402799-10
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 factory setting for the carburetor is set for the following val-
ues.
Height above sea
level
301 … 750 m (988 … 2,461 ft)
Ambient tempera-
ture
16 … 24 °C (61 … 75 °F)
Super unleaded (98 octane) mixed with 2-stroke engine oil
(1:40) ( p. 124)
The idle speed is adjusted with adjusting screw
1
.
The idle mixture is adjusted using the idle air adjusting screw
2
.
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