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Description
4180 121 8900 STIHL Pin – Genuine OEM Carburetor Part
The STIHL Pin (4180 121 8900) is a genuine OEM replacement carburetor pin designed for use in select STIHL professional trimmers, brushcutters, edgers, hedge trimmers, and KombiMotor units equipped with C1Q-series carburetors.
This pin is an internal carburetor component that supports correct lever and linkage movement inside the fuel metering system. Proper pin function is essential for smooth throttle response, consistent fuel delivery, and stable engine operation.
Manufactured to STIHL factory specifications, this OEM pin ensures the correct fit, strength, and long-term durability required for reliable carburetor performance.
Replacing a worn, bent, or missing pin helps restore proper carburetor operation and prevents fuel or running issues.
Product Details
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OEM Part Number: 4180 121 8900
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Brand: STIHL (Genuine OEM)
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Part Type: Carburetor Pin
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Application: Internal carburetor linkage / lever support pin
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Condition: New Genuine OEM Part
Function
This OEM carburetor pin is designed to:
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Support correct fuel metering lever operation
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Maintain smooth throttle and linkage movement
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Replace damaged, worn, or missing carburetor pins
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Help ensure consistent engine performance
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Prevent running, flooding, or hard-starting issues
⚠️ A damaged or missing carburetor pin may cause poor fuel delivery, rough idle, or starting problems.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4180 121 8900
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Carburetor model matches your unit (C1Q-series)
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Application matches your STIHL illustrated parts diagram
⚠️ Carburetor internal components vary by configuration — always verify fitment by OEM number.
Compatibility
Fits select STIHL models and carburetor configurations, including:
Trimmers / Brushcutters
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FS 90 / FS 90 R (4180) – Carburetor C1Q-S174, C1Q-S131
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FS 100 RX – Carburetor C1Q-S174, C1Q-S131
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FS 110 / FS 110 R / FS 110 RX – Carburetor C1Q-S174, C1Q-S131
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FS 130 / FS 130 R – Carburetor C1Q-S173, C1Q-S130, C1Q-S175, C1Q-S132
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FS 310 – Carburetor C1Q-S176, C1Q-S133
Edgers
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FC 90 – Carburetor C1Q-S174, C1Q-S131
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FC 95 – Carburetor C1Q-S174, C1Q-S131
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FC 100 – Carburetor C1Q-S174, C1Q-S131
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FC 110 – Carburetor C1Q-S174, C1Q-S131
KombiMotors
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KM 90 R – Carburetor C1Q-S174, C1Q-S131
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KM 110 R – Carburetor C1Q-S174, C1Q-S131
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KM 130 R – Carburetor C1Q-S173, C1Q-S130
Hedge Trimmers / Pole Pruners
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HL 90 K – Carburetor C1Q-S174, C1Q-S131
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HL 100 / HL 100 K – Carburetor C1Q-S174, C1Q-S131
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HT 100 / HT 101 – Carburetor C1Q-S174, C1Q-S131
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HT 130 – Carburetor C1Q-S173, C1Q-S130
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HT 131 – Carburetor C1Q-S173, C1Q-S130
Augers
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BT 130 – Carburetor C1Q-S176
(Exact application varies by carburetor configuration — always confirm using OEM parts diagrams.)
Installation Notes
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Remove carburetor from engine as required
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Disassemble carburetor carefully in a clean workspace
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Install pin 4180 121 8900 in the correct linkage position
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Verify smooth lever movement before reassembly
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Reinstall carburetor and adjust if necessary
⚠️ Carburetor service should be performed by a qualified technician.
Maintenance Tips
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Use clean, fresh fuel to prevent carburetor wear
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Inspect carburetor linkage components during service intervals
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Always use genuine STIHL OEM carburetor parts for correct fit and durability
