30 – English
CARBURETTOR
WARNING!
The fuel used in the chainsaw has the
following hazardous properties:
1. The fluid and its fumes are poisonous.
2. Can cause skin irritation.
3. Is highly inflammable.
Carburettor
!
Description
The drawings accompanying this description do not
correspond with the carburettor on the chainsaw. They only
show the principle for the design and function.
Design
The carburettor is based on three sub-systems:
• The metering unit, A in fig. 1.
• The mixing venturi, B in fig. 2.
• The pump unit, C in fig. 3.
The jets and the fuel’s control functions are located in the
metering unit (A). Here the correct quantity of fuel is adjusted
for the actual speed and power output.
The mixing venturi (B) houses the choke, throttle valve and
diffuser jets. Here air is mixed with the fuel to give a fuel/air
mixture that can be ignited by the ignition spark.
In the pump unit (C), fuel is pumped from the fuel tank to the
metering unit. One side of the pump diaphragm is connected
to the crankcase and pulses in time with the pressure
changes in the crankcase. The other side of the diaphragm
pumps the fuel.
Fig. 2 B
Fig. 3 C
Fig. 1 A
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