Description
4140 120 0634 STIHL Carburetor 4140/34 Genuine OEM Part
The STIHL Carburetor 4140/34 (4140 120 0634) is a genuine OEM carburetor assembly designed to deliver accurate fuel and air mixture control for reliable performance on select STIHL trimmers, brushcutters, Kombi powerheads, and hedge trimmers. This carburetor helps restore smooth starting, stable idle, and strong throttle response when replacing a clogged, leaking, or worn carburetor.
Manufactured to STIHLs exact factory specifications, this OEM carburetor ensures correct fitment, dependable operation, and long-lasting durability.
Product Details
OEM Part Number: 4140 120 0634
Brand: STIHL (Genuine OEM)
Part Type: Carburetor Assembly
Carburetor Type: 4140/34
Application: Fuel System / Engine Intake
Condition: New Genuine OEM Part
Function
This carburetor is designed to:
Provide proper air/fuel mixture for efficient engine performance
Improve starting and throttle response
Maintain smooth idle and consistent fuel delivery
Replace clogged, leaking, or malfunctioning carburetors
Restore safe and reliable equipment operation
A failing carburetor may cause hard starting, stalling, surging, or loss of power.
Verify Fitment in 30 Seconds
Before ordering, confirm the following:
OEM part number 4140 120 0634
Carburetor type 4140/34
Your STIHL model is listed below
Part location matches your carburetor diagram
Always verify fitment by OEM part number for best accuracy.
Compatibility
Fits select STIHL equipment including:
Trimmers / Brushcutters
FS 45
FS 45 D
FS 45 C-E
FS 46
FS 46-D
FS 46 C-E
FS 46 C-E D
FS 55
FS 55 R
FS 55 R-D
FS 55-D
FS 55 RC-E
FS 55 RC-E D
FS 55 C-E D
Kombi Tools
KM 55 R
KM 55 R-D
KM 55 RC-E
KM 55 RC-E D
Hedge Trimmers / Long-Reach Units
HL 45-D
Edgers
FC 55
FC 55-D
This list includes common applications always confirm using your parts diagram or owners manual.
Installation / Usage
Turn off engine and allow it to cool
Remove air filter cover and air filter
Disconnect throttle linkage and fuel lines
Remove the old carburetor
Install STIHL OEM carburetor 4140 120 0634
Reconnect linkages and fuel lines securely
Reinstall air filter and covers
Test operation and adjust if required
Professional installation is recommended if unsure.
Maintenance Tips
Use fresh fuel with correct mix ratio
Keep the air filter clean to protect the carburetor
Inspect fuel lines for cracks or leaks
Drain fuel for long-term storage to prevent gumming
