BR420 BR340 Carburetor Kit - Fits Stihl BR340 BR380 BR400 BR420C - Replaces Stihl 4203-120-0601

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.