Carburettor - Husqvarna 335XPT Workshop Manual

Description
!
WARNING!
The fuel used in the chain saw poses the
following hazards:
• The fluid and its vapours are poisonous.
• Can cause skin irritation.
• Is highly inflammable.
The diagrams in this description do not correspond with the
carburettor fitted on the chain saw. They serve only to show the
principles of design and operation. The carburettor consists of
three sub-systems:
Metering unit
The metering unit (A) contains the jets and fuel control func-
tions. It is here the correct amount of fuel for the given engine
speed and power is metered.
Mixing venturi
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.
Pump unit
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.

CARBURETTOR

A
B
C
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