Construction and function
Carburettor
The carburettor works in different ways depending
on the setting:
The carburettor consists of three sub-systems:
•
•
•
•
Cold start mode
Idling mode
Part throttle mode
Full throttle mode
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•
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The metering unit (A) which contains the jets
and the fuel control mechanism. This measures
out the right amount of fuel to suit the speed of
the saw and the power demand.
In the cold start mode the choke valve (D) is
completely closed. This increases the vacuum in
the carburettor so that fuel is sucked through the
diffuser jets faster (E).
The mixing unit (B) consists of the choke, dif-
fuser jets and throttle valve. This is where the air
and fuel are mixed to create a flammable mix-
ture.
The pump unit (C) pumps fuel from the tank to
the metering system inside the carburettor. One
side of the pump diaphragm is connected to the
crankcase and pulses as a result of pressure
changes in the crankcase. The other side of the
diaphragm sucks in the fuel.
In idling mode the throttle valve (F) is closed. Air
is sucked through an aperture in the throttle valve
and a small amount of fuel is supplied through the
diffuser jet (E).
English – 9
| Categories | Chainsaw Manuals, Husqvarna Chainsaw Manuals |
|---|---|
| Tags | Husqvarna 340, Husqvarna 345, Husqvarna 346XP, Husqvarna 350, Husqvarna 351, Husqvarna 353 |
| Model Year | 2003, 2004, 2005, 2006 |
| Download File |
|
| Document Type | Operator's Manual |
| Language | English |
| Product Brand | Husqvarna, Chainsaw |
| Document File Type | |
| Publisher | husqvarna.com |
| Wikipedia's Page | Husqvarna |
| Copyright | Attribution Non-commercial |
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