Technical Information 37.2007 Page 7
TI_37_2007_30_01_02.fm
1.2.6 Carburetor
The fuel-free air and fuel-air mixture follow separate paths. Each has its own throttle shutter. The throttle
shutter (2) of the fuel-free air path is actuated via a throttle rod (3) from the throttle shutter (1) of the fuel-air
mixture path. The oblong hole (5) in the actuating lever (4) ensures that the throttle shutter (2) in the fuel-free
air path opens later.
1.3 Setting of the choke lever for starting
. c when the engine is cold
. e when the engine is warm (even if the engine
has already run but is still cold and also if the hot
engine has been switched off for less than
5 minutes)
. o when the engine is hot (if the hot engine has
been switched off for more than 5 minutes)
Operating condition Throttle shutter (1) of the fuel-air
mixture path
Throttle shutter (2) of the fuel-
free path
a) Idle speed Completely closed Completely closed
b) Part throttle Opening angle < 35° Completely closed
Part throttle Opening angle > 35° The throttle shutter of the fuel-
free air path opens more and
more with increasing load
c) Full throttle Completely open Completely open
370TI002 KN
2
1
3
4
5
a
b
c
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