English – 35
Repair instructions
7.13 Carburettor
Description
The images for this description do not correspond
to the carburettor on the chain saw. They purely
show the principle for the design and function. The
carburettor is based on three sub-systems:
Metering unit
The needles and the fuel’s control functions are
located in the metering unit A. Here the correct
fuel amount is adjusted for the current speed and
power output.
Pump unit
In the pump unit C fuel is pumped from the fuel
tank to the carburettor’s metering unit. One side
of the pump diaphragm is connected to the crank-
case and pulses in time with the pressure changes
in the crankcase. The other side of the diaphragm
pumps the fuel.
Mixing venturi
The mixing venturi B houses the choke, throttle
valve and diuser jets. Here, air and fuel are
mixed to create a fuel-air mix that can be ignited by
the ignition spark.
WARNING!
The fuel used for the chain saw
has the following characteristics:
1. The liquid and its fumes are poi-
sonous.
2. Can cause skin irritation.
3. Is very ammable.
Fig 33
Fig 34
Fig 35
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