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Description
4180 129 0900 STIHL Gasket – Genuine OEM Part
The STIHL Gasket (4180 129 0900) is a genuine OEM replacement gasket designed for use on select STIHL professional trimmers, brushcutters, edgers, hedge trimmers, and KombiMotor units.
This gasket is used in the muffler and air filter area depending on model configuration, helping provide a proper seal between engine components. Correct sealing is essential for preventing air or exhaust leaks and maintaining stable engine performance.
Manufactured to STIHL factory specifications, this gasket ensures correct fitment, durability, and long service life.
Replacing a worn or damaged gasket helps restore proper sealing and prevents performance issues.
Product Details
-
OEM Part Number: 4180 129 0900
-
Brand: STIHL (Genuine OEM)
-
Part Type: Gasket
-
Application: Muffler / Air filter sealing gasket (model-specific)
-
Condition: New Genuine OEM Part
Function
This OEM gasket is designed to:
-
Provide a secure seal between engine components
-
Prevent air or exhaust leaks
-
Maintain proper airflow and engine efficiency
-
Replace damaged or leaking gaskets
-
Support consistent engine performance
⚠️ A leaking gasket may cause overheating, power loss, or poor running conditions.
Verify Fitment (Recommended)
Before ordering, confirm:
-
OEM part number 4180 129 0900
-
Correct placement in muffler or air filter assembly
-
Engine size matches your model (Ø 38 mm or Ø 40 mm where noted)
-
Fitment matches your STIHL illustrated parts diagram
⚠️ Always verify fitment by OEM number, as gasket applications vary by model and configuration.
Compatibility
Fits select STIHL models and configurations, including:
Trimmers / Brushcutters
-
FS 90 / FS 90 R (4180)
-
FS 91 / FS 91 R / FS 91.0
-
FS 100 RX
-
FS 110 / FS 110 R / FS 110 RX
-
FS 111 / FS 111 R
Edgers
-
FC 90
-
FC 91
-
FC 95
-
FC 96
-
FC 100
-
FC 110
-
FC 111
KombiMotors
-
KM 90 R
-
KM 91 R
-
KM 111 R
Hedge Trimmers / Pole Pruners
-
HL 90 K
-
HL 100 / HL 100 K
-
HT 100
-
HT 101
-
HT 102
-
HT 105
-
HT 134
(Exact application varies by engine size and configuration — verify using OEM parts diagram.)
Installation Notes
-
Remove muffler or air filter housing as required
-
Clean all mating surfaces
-
Install gasket 4180 129 0900 in the correct position
-
Reassemble components securely
-
Inspect for leaks after installation
⚠️ Replace gaskets whenever components are removed to ensure proper sealing.
Maintenance Tips
-
Inspect gaskets during routine service
-
Replace any gasket showing cracks, compression, or leakage
-
Always use genuine STIHL OEM parts for correct fit and durability
The STIHL Gasket (4180 129 0900) is a genuine OEM replacement gasket designed for use on select STIHL professional trimmers, brushcutters, edgers, hedge trimmers, and KombiMotor units.
This gasket is used in the muffler and air filter area depending on model configuration, helping provide a proper seal between engine components. Correct sealing is essential for preventing air or exhaust leaks and maintaining stable engine performance.
Manufactured to STIHL factory specifications, this gasket ensures correct fitment, durability, and long service life.
Replacing a worn or damaged gasket helps restore proper sealing and prevents performance issues.
Product Details
-
OEM Part Number: 4180 129 0900
-
Brand: STIHL (Genuine OEM)
-
Part Type: Gasket
-
Application: Muffler / Air filter sealing gasket (model-specific)
-
Condition: New Genuine OEM Part
Function
This OEM gasket is designed to:
-
Provide a secure seal between engine components
-
Prevent air or exhaust leaks
-
Maintain proper airflow and engine efficiency
-
Replace damaged or leaking gaskets
-
Support consistent engine performance
⚠️ A leaking gasket may cause overheating, power loss, or poor running conditions.
Verify Fitment (Recommended)
Before ordering, confirm:
-
OEM part number 4180 129 0900
-
Correct placement in muffler or air filter assembly
-
Engine size matches your model (Ø 38 mm or Ø 40 mm where noted)
-
Fitment matches your STIHL illustrated parts diagram
⚠️ Always verify fitment by OEM number, as gasket applications vary by model and configuration.
Compatibility
Fits select STIHL models and configurations, including:
Trimmers / Brushcutters
-
FS 90 / FS 90 R (4180)
-
FS 91 / FS 91 R / FS 91.0
-
FS 100 RX
-
FS 110 / FS 110 R / FS 110 RX
-
FS 111 / FS 111 R
Edgers
-
FC 90
-
FC 91
-
FC 95
-
FC 96
-
FC 100
-
FC 110
-
FC 111
KombiMotors
-
KM 90 R
-
KM 91 R
-
KM 111 R
Hedge Trimmers / Pole Pruners
-
HL 90 K
-
HL 100 / HL 100 K
-
HT 100
-
HT 101
-
HT 102
-
HT 105
-
HT 134
(Exact application varies by engine size and configuration — verify using OEM parts diagram.)
Installation Notes
-
Remove muffler or air filter housing as required
-
Clean all mating surfaces
-
Install gasket 4180 129 0900 in the correct position
-
Reassemble components securely
-
Inspect for leaks after installation
⚠️ Replace gaskets whenever components are removed to ensure proper sealing.
Maintenance Tips
-
Inspect gaskets during routine service
-
Replace any gasket showing cracks, compression, or leakage
-
Always use genuine STIHL OEM parts for correct fit and durability
