15 TUNING THE ENGINE
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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 carburation. The larger the diameter of the first cylindrical part of
the needle, the leaner the carburation. The first cylindrical part of the needle has the greatest influence in the
lowest load adjustment.
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 oper-
ating conditions.
15.4 Carburetor - idle
402799-10
The idle setting of the carburetor has a big influence on the start-
ing behavior, stable idling, and the response to throttle opening.
This means that an engine with a correctly set idle speed is eas-
ier to start than if the idle speed is set wrongly.
Info
The carburetor and its components are subject to
increased wear caused by engine vibration. Wear can
result in malfunctioning.
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. 122)
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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