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Needle overview
The jet needles available are shown in the following table.
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.
Carburetor – idle setting
15.4
Clip position
1 ... 5
The five possible clip positions are shown here.
The carburetor tuning depends on the defined ambient and oper-
ating conditions.
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The idle setting of the carburetor has a big influence on the
starting behavior, stable idle speed, and the response to throttle
opening. 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
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result in malfunctioning.
The factory setting for the carburetor is set for the following val-
ues.
Height above sea
level
Ambient tempera-
ture
TUNING THE ENGINE 15
Clip position from above
301 ... 750 m (988 ... 2,461 ft)
16 ... 24 °C (61 ... 75 °F)
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105
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