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Description
4237 120 1800 STIHL Air Filter – Genuine OEM Carburetor Part
The STIHL Air Filter (4237 120 1800) is a genuine OEM intake component designed to provide clean airflow to the carburetor on select STIHL professional hedge trimmers. This filter helps protect the engine from dust, debris, and contaminants while maintaining proper fuel-air mixture balance for consistent cutting performance.
Over time, air filters can become clogged with dirt, restricting airflow and causing poor engine performance, hard starting, rough idle, or reduced power output. Replacing a worn or heavily contaminated filter with the correct OEM part restores optimal airflow without replacing the entire intake assembly.
Manufactured to STIHL factory specifications, this genuine air filter ensures precise fitment, effective filtration, and long-term durability under demanding professional operating conditions.
Product Details
OEM Part Number: 4237 120 1800
Brand: STIHL (Genuine OEM)
Part Type: Air Filter
Application: Air intake / carburetor filtration system
Condition: New Genuine OEM Part
Function
This STIHL air filter is designed to:
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Protect the carburetor and engine from debris
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Maintain proper airflow for correct fuel-air mixture
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Improve throttle response and idle stability
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Replace clogged or worn air filters
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Support long-term engine performance and reliability
⚠️ A dirty or clogged air filter can cause hard starting, reduced power, and poor fuel efficiency.
Verify Fitment (Recommended)
Before ordering, confirm:
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OEM part number 4237 120 1800
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Your unit model matches those listed below
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Application matches your STIHL illustrated parts diagram
⚠️ Air filters are model-specific — always verify by OEM part number and equipment type.
Compatibility
This OEM air filter fits select STIHL hedge trimmer models with specific air filter and spacer flange configurations, including:
Hedge Trimmers
HS 81 R (Air filter)
HS 81 T (Air filter)
HS 82 R (Spacer flange, Air filter)
HS 82 T (Spacer flange, Air filter)
HS 86 R (Air filter)
HS 86 T (Air filter)
HS 87 R (Spacer flange, Air filter)
HS 87 T (Spacer flange, Air filter)
(Exact fitment depends on production version — always verify using OEM parts diagram.)
Installation Notes
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Remove air filter cover
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Remove old or contaminated filter
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Clean air filter housing if necessary
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Install new filter in correct orientation
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Reinstall cover securely
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Test engine for proper idle and throttle response
⚠️ Ensure filter is seated properly to prevent unfiltered air from entering the carburetor.
Maintenance Tips
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Inspect air filter regularly during heavy use
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Clean or replace filter according to STIHL service intervals
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Keep air intake area free of debris
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Replace filter if damaged or excessively dirty
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Always use genuine STIHL OEM air filters for proper fit and engine protection
