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4128 121 8901 STIHL Pin – Genuine OEM Part

4128 121 8901 STIHL Pin – Genuine OEM Part

Original price was: $4.71.Current price is: $1.41.

SKU: 4128 121 8901 Category: Tag:

Description

4128 121 8901 STIHL Pin – Genuine OEM Part

The STIHL Pin (4128 121 8901) is a genuine OEM replacement component designed for use in the carburetor assemblies of many STIHL professional brushcutters, backpack blowers, hedge trimmers, sprayers, and KombiSystem units. This pin is a critical small hardware part that helps secure internal carburetor components, ensuring correct fuel metering and dependable engine operation.

Manufactured to STIHL’s exact specifications, this OEM pin ensures proper fitment, long-lasting durability, and reliable performance when replacing worn or missing carburetor parts.

Product Details

  • OEM Part Number: 4128 121 8901

  • Brand: STIHL (OEM)

  • Part Type: Pin

  • Application: Carburetor Assembly (C1Q / C1M Series)

  • Condition: New Genuine OEM Part

Function

This pin is designed to:

  • Secure internal carburetor components in position

  • Support proper fuel metering and engine performance

  • Replace worn, bent, or missing carburetor pins

  • Restore correct carburetor function

  • Maintain reliable starting and smooth running

⚠️ A damaged or missing pin may lead to fuel delivery issues or poor engine operation.

Verify Fitment in 30 Seconds

Before ordering, confirm the following:

  • OEM part number 4128 121 8901

  • Part location: carburetor assembly

  • Compatible STIHL model listed below

⚠️ Always verify fitment by OEM part number for best accuracy.

Compatibility

Fits a wide range of STIHL equipment, including:

Brushcutters / Trimmers

  • FS 90, FS 90 R

  • FS 100 RX

  • FS 110, FS 110 R, FS 110 RX

  • FS 120, FS 120 R

  • FS 130, FS 130 R

  • FS 200 R

  • FS 250, FS 250 R

  • FS 310, FS 350

  • FS 450-K

KombiSystem Units

  • KM 90 R

  • KM 110 R

  • KM 130 R

Backpack Blowers

  • BR 200

  • BR 350

  • BR 430

  • BR 450, BR 450 C-EF

  • BR 500

  • BR 550

  • BR 600

  • BR 700, BR 700 X

Sprayers / Mistblowers

  • SR 200

  • SR 430

  • SR 450

Hedge Trimmers

  • HS 45

  • HS 81 R, HS 81 T, HS 81 TC-E

  • HS 82 R, HS 82 T

  • HS 86 R, HS 86 T

  • HS 87 R, HS 87 T

Pole Pruners / Long Reach Units

  • HL 90 K

  • HL 100, HL 100 K

  • HT 100, HT 101

  • HT 130

  • HT 250

Specialty Units

  • FC 90, FC 95, FC 100

  • FC 110

  • BT 120 C, BT 121

  • SP 200

⚠️ This list includes common applications — always confirm using your parts diagram or owner’s manual.

Installation / Usage

  1. Turn off engine and allow it to cool completely

  2. Remove air filter housing and carburetor access components

  3. Disassemble carburetor carefully in a clean workspace

  4. Replace the worn or missing pin with the new STIHL OEM part

  5. Reassemble carburetor and test engine operation

⚠️ Carburetor service should be performed by a qualified technician if unsure.

Maintenance Tips

  • Use fresh fuel and proper fuel mix ratios

  • Keep air filters clean to prevent carb contamination

  • Inspect carburetor hardware regularly for wear

  • Replace damaged pins immediately to avoid running issues

  • Use only genuine STIHL replacement parts for best fit and reliability

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