Leaf Blower [Lifetime Warranty] BR420 BR340 Carburetor Kit - Compatible with Stihl BR340 BR380 BR400 BR420C BR320 SR320 SR340 SR380 SR400 SR420 Backpack Blower - Replace Stihl 4203-120-0601
Carburetor repair kit for Stihl backpack blowers including carburetor, air filter, spark plug, fuel line, and gaskets.
Replacement carburetor for Stihl BR340 and BR420 backpack blowers with promotional text overlay.
Complete carburetor maintenance kit for Stihl backpack blowers including carburetor, air filter, spark plug, and gaskets.
Dimensional diagram of BR420 BR340 carburetor for Stihl backpack blowers showing measurements in inches.
Replacement carburetor for Stihl BR340, BR380, and BR420 backpack blowers with compatibility and part number info.
Diagram of Stihl BR420 blower carburetor showing fuel inlet, impulse port, and idle, high, and low speed adjustment screws.
Four-angle view of aluminum alloy carburetor for Stihl BR340, BR420, and SR series backpack blowers.
Pleated paper air filter for Stihl backpack blowers with high-density filtration and durable rubber seal.
Dimensional diagram showing air filter, spark plug, and fuel filter for Stihl BR420 backpack blower maintenance kit.
Replacement carburetor for Stihl backpack blowers shown with a person using a leaf blower in the background.
Carburetor repair kit for Stihl backpack blowers including carburetor, air filter, spark plug, fuel line, and gaskets.
Replacement carburetor for Stihl BR340 and BR420 backpack blowers with promotional text overlay.
Complete carburetor maintenance kit for Stihl backpack blowers including carburetor, air filter, spark plug, and gaskets.
Dimensional diagram of BR420 BR340 carburetor for Stihl backpack blowers showing measurements in inches.
Replacement carburetor for Stihl BR340, BR380, and BR420 backpack blowers with compatibility and part number info.
Diagram of Stihl BR420 blower carburetor showing fuel inlet, impulse port, and idle, high, and low speed adjustment screws.
Four-angle view of aluminum alloy carburetor for Stihl BR340, BR420, and SR series backpack blowers.
Pleated paper air filter for Stihl backpack blowers with high-density filtration and durable rubber seal.
Dimensional diagram showing air filter, spark plug, and fuel filter for Stihl BR420 backpack blower maintenance kit.
Replacement carburetor for Stihl backpack blowers shown with a person using a leaf blower in the background.
Lifetime Warranty

[Lifetime Warranty] BR420 BR340 Carburetor Kit - Compatible with Stihl BR340 BR380 BR400 BR420C BR320 SR320 SR340 SR380 SR400 SR420 Backpack Blower - Replace Stihl 4203-120-0601

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4203-120-0601 Carburetor Kit

Key Features

  • Complete carburetor replacement kit for Stihl backpack blowers.
  • Includes carburetor, gaskets, fuel filter, spark plug, fuel lines, and primer bulb.
  • Engineered to meet or exceed original equipment specifications for fit and performance.
  • Designed for consistent fuel and air mixing to restore engine power.

Replaces / Cross-Reference Part Numbers

  • 4203-120-0601
  • 4203-120-0603
  • 4203-120-0605
  • 4203-120-0607
  • HD-4A
  • HD-4B
  • HD-13B

Compatibility & Fitment

  • Fits Stihl Backpack Blowers:
    • BR320
    • BR340, BR340L
    • BR380
    • BR400
    • BR420, BR420C
    • SR320
    • SR340
    • SR380
    • SR400
    • SR420

When to Replace

  • Engine will not start or is difficult to start.
  • Engine idles poorly, stalls, or surges.
  • Lack of power or poor acceleration during operation.
  • Black smoke emitting from the exhaust.
  • Visible fuel leakage from the carburetor body.

Installation Tips

  • Disconnect the spark plug wire before beginning installation for safety.
  • Take a picture of the old carburetor's linkage and fuel line connections for reference.
  • Ensure all gasket surfaces are clean and free of debris before installing new parts.
  • Replace fuel lines and filter at the same time as the carburetor for optimal performance.
  • After installation, minor adjustments to the idle and mixture screws may be necessary.

FAQ

This carburetor kit is commonly listed for Stihl backpack blower and sprayer/blower models BR320, BR340, BR380, BR400, BR420, BR420C, SR320, SR340, SR380, SR400, and SR420. Some cross-reference listings also include BR340L. The best way to confirm fit is to match your original carburetor or IPL part number to 4203-120-0601, 4203-120-0603, 4203-120-0605, or 4203-120-0607, and check the carb body marking if visible.
This replacement is associated with Stihl part number 4203-120-0601. Cross-referenced numbers found for the same carburetor family include 4203-120-0603, 4203-120-0605, and 4203-120-0607. It is also commonly matched to Walbro carburetor numbers HD-4A, HD-4B, and HD-13B.
Common carburetor-related symptoms on these Stihl backpack blowers include hard starting, only running on choke, surging at idle, bogging under throttle, fuel leaking, poor acceleration, and stalling after a few seconds. A blower that sat with old fuel for a long time often develops varnish or diaphragm problems inside the carburetor, which can cause these issues.
For an experienced DIYer, this is usually a moderate repair. On backpack blowers, access is tighter than on handheld equipment because you typically need to remove the cover, air filter housing, throttle linkage, and fuel lines before swapping the carburetor. Basic tools usually include screwdrivers, needle-nose pliers, a pick for fuel lines, and possibly Torx drivers. Plan on about 30 to 90 minutes depending on model condition and how much disassembly is needed.
Before installation, drain stale fuel, inspect the fuel lines for cracking or soft spots, check the fuel filter, inspect the intake gasket, and make sure the impulse line is connected and not damaged. It is also smart to inspect the air filter and spark plug. If the blower still will not run correctly after a carburetor swap, check for air leaks, restricted exhaust, weak ignition, or a damaged primer/fuel system if equipped.
The most common cause is old fuel, especially fuel containing ethanol. Ethanol can attract moisture, leave deposits, stiffen diaphragms, and damage small internal passages. Long storage with fuel left in the system is a major cause. Heat, vibration, dirty fuel, and deteriorated fuel lines can also shorten carburetor life on BR and SR series backpack units.