Table of Contents
Advertisement
15 TUNING THE ENGINE
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 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.
15.4
104
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.
1
0 0 1
2
0 0 2
0 0 3
3
4
0 0 4
0 0 5
5
B00075-10
Carburetor – idle
402799-10
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.
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
301 ... 750 m (988 ... 2,461 ft)
level
Ambient tempera-
16 ... 24 °C (61 ... 75 °F)
ture
402674-01
Advertisement
Table of Contents
