Carburettor - Husqvarna 371K Workshop Manual Supplement

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CARBURETTOR

Carburettor with built-in filter compensation
The carburettor has a built-in filter compensation mechanism that ensures the
machine gets the right fuel/air mixture almost regardless of how badly the filters
are clogged. The results of this design are:
• consistently high engine output
• better filter economy, long service intervals
• lower fuel consumption
• less air pollution
Thermally insulated, vibration-damped carburettor
Every engine produces some vibration. The carburettor contains a number of
moving parts, such as the inlet needle with its control lever and diaphragm, and
the choke and throttle shafts. Their operation is affected by vibration, and the
greater the mass (weight) of the parts, the greater the effect. (Lightweight parts
can accommodate fluctuating vibration more easily than heavy parts).
The moving parts of the carburettor are larger in large machines, and the 371K
and 3120K Air Injection therefore have a vibration-damping element between the
cylinder and carburettor.
The element between the cylinder and carburettor also acts as a thermal insulator
and prevents vapour locks forming in the carburettor.
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