×
Description
4203 120 0610 STIHL Carburetor HD-45 – Genuine OEM Part
The STIHL Carburetor HD-45 (4203 120 0610) is a genuine OEM replacement carburetor designed for use on select STIHL backpack blowers and sprayers equipped with HD-series carburetors.
This carburetor is responsible for precisely metering fuel and air to the engine, ensuring proper combustion, smooth throttle response, and reliable engine performance. Correct carburetor operation is critical for starting, power output, fuel efficiency, and emissions control.
Manufactured to STIHL factory specifications, this OEM HD-45 carburetor ensures correct calibration, fitment, and durability under professional operating conditions.
Replacing a worn, damaged, or improperly functioning carburetor helps restore proper engine operation and prevents performance issues such as hard starting, surging, or power loss.
Product Details
-
OEM Part Number: 4203 120 0610
-
Brand: STIHL (Genuine OEM)
-
Part Type: Carburetor
-
Carburetor Model: HD-45
-
Application: Engine fuel system (model-specific)
-
Condition: New Genuine OEM Part
Function
This OEM carburetor is designed to:
-
Meter the correct fuel-air mixture for combustion
-
Support smooth idle and consistent throttle response
-
Maintain proper engine performance under load
-
Replace worn, clogged, or damaged carburetors
-
Help prevent starting issues, surging, or power loss
⚠️ A faulty carburetor may cause hard starting, rough running, or poor engine performance.
Verify Fitment (Recommended)
Before ordering, confirm:
-
OEM part number 4203 120 0610
-
Carburetor type HD-45 matches your engine
-
Application matches your STIHL illustrated parts diagram
⚠️ Multiple carburetor versions (HD-28, HD-29, HD-45) may be used depending on production year — always verify by OEM part number.
Compatibility
Fits select STIHL models and configurations, including:
-
BR 340 (Carburetor HD-28 / HD-29 / HD-45)
-
BR 380 (Carburetor HD-28 / HD-29 / HD-45)
-
BR 420 (Carburetor HD-28 / HD-29 / HD-45)
-
BR 420 C (Carburetor HD-28 / HD-29 / HD-45)
-
SR 420 (Air filter, Ignition system – HD-series carburetor applications)
(Exact application depends on configuration and production version — verify using OEM parts diagram.)
Installation Notes
-
Remove air filter and carburetor cover components
-
Disconnect fuel lines and throttle linkage carefully
-
Install carburetor 4203 120 0610 in correct orientation
-
Adjust carburetor settings according to STIHL specifications
-
Reassemble and test engine operation
⚠️ Carburetor installation and adjustment should be performed by a qualified technician.
Maintenance Tips
-
Use clean, fresh fuel to prevent carburetor contamination
-
Replace fuel lines and filters if contaminated
-
Inspect carburetor diaphragms during service
-
Always use genuine STIHL OEM fuel system components for correct calibration and durability

