Genuine STIHL HD2 Air Filter for MS 661 Chainsaws | OEM Part 1144 140 4402 / 1144 124 3800

Maximum Engine Protection for Professional Forestry Work

Forestry professionals know that a clean air filter is the lungs of a chainsaw. Keep your STIHL MS 661 running at peak performance with this 100% Genuine STIHL HD2 Air Filter. Designed specifically for heavy-duty commercial use, this authentic OEM replacement part ensures optimal airflow while trapping the finest dust particles, preventing them from entering and damaging your engine.

Advanced HD2 Filtration Technology: Unlike standard filters, the STIHL HD2 filter is made of a special PET material featuring pores that are up to 70% finer than fleece or polyamide filters. It is highly effective at filtering fine dust and is both oil and water-repellent, making it incredibly easy to clean and maintain.

Product Specifications:

Brand: Genuine STIHL (OEM)

Filter Type: HD2 (High-Density Pleated Filter)

STIHL Part Numbers: 1144 140 4402 (Assembly) / Also replaces or is marked as 1144 124 3800

Features: Washable, reusable, and built for extreme environments.

OEM Compatibility: Engineered for an exact fit on STIHL professional chainsaws, including:

STIHL MS 661

STIHL MS 661 C-M (Magnum / Rescue variants)

STIHL MS 661 R C-M

Why Choose Genuine STIHL Air Filters?

Perfect Seal: Prevents unfiltered air and debris from bypassing the filter housing.

Extended Engine Life: Superior filtration protects the cylinder and piston from premature wear.

Maintained Power: Ensures the correct air/fuel mixture for optimal RPM and cutting power.

Pro Tip: Regularly inspect and clean your HD2 filter with STIHL Varioclean or warm soapy water. Replace it immediately if the filter material is torn or heavily heavily soiled.