Carburetor for Husqvarna 357 XP and 359 Chainsaws – 505 20 30-01 / 505 20 30-02

Description

This Husqvarna 359 carburetor is an aftermarket diaphragm-type fuel-metering unit for selected Husqvarna 357 XP and 359 chainsaws. It replaces a worn carburettor that causes difficult starting, unstable idling, hesitation or inconsistent fuel delivery.

Husqvarna 359 carburettor compatibility

Comparison references:

• 505 20 30-01
• 505203001
• 505 20 30-02
• 505203002

Husqvarna parts diagrams list 505 20 30-01 as a carburettor with sleeve and show that the reference was superseded by 505 20 30-02.

Verified applications include selected versions of:

• Husqvarna 357 XP
• Husqvarna 359

Some marketplace listings use shortened names such as “357” or add “XP” to the 359 designation. However, the parts documentation identifies the principal models as 357 XP and 359. Therefore, use the product references and physical connections rather than relying only on marketplace model wording.

Product details

• Product type: diaphragm carburettor
• Application: two-stroke petrol chainsaw
• Primary reference: 505 20 30-01
• Superseding reference: 505 20 30-02
• Brand: Winzor
• Condition: new aftermarket replacement
• Package contents: carburettor shown in the photographs

The carburettor regulates the fuel-and-air mixture as engine airflow changes. Consequently, worn diaphragms, internal leakage or blocked metering passages can cause poor starting, uneven idle and weak acceleration.

However, a carburettor replacement will not correct every running problem. A damaged intake boot, leaking crankshaft seal, blocked fuel filter, hardened fuel hose, incorrect tank ventilation or low compression can create similar symptoms. Therefore, inspect these areas before installing the new part.

Compare the intake and air-filter faces, mounting holes, fuel connections, impulse arrangement, throttle lever and choke control with the original carburettor. In addition, replace damaged gaskets and hoses rather than reusing parts that may leak.

After installation, adjust the carburettor according to the service requirements for the exact machine. Finally, confirm reliable acceleration, stable idle and correct maximum engine speed. An excessively lean setting can overheat the engine and damage the piston or cylinder.

Browse related Husqvarna 357 parts and Husqvarna 359 parts. Operating information is available in the official Husqvarna 357 XP and 359 manual.