STIHL Air Filter - 4140 124 2800

The 4140 124 2800 air filter delivers factory-specified particulate filtration for Stihl two-stroke powerheads, maintaining optimal air-to-fuel ratios while blocking abrasive dust from reaching cylinder walls and crankshaft ports. Engineered as a direct interchange for original equipment assemblies, this unit mounts directly to the intake housing without adapter plates or sealant.

Key Features

• Multi-layer cellulose and polymer media calibrated to OEM micron thresholds
• Perimeter foam gasket compresses evenly to prevent unfiltered bypass air
• Precision-molded intake frame matches factory mounting hole spacing
• Drop-in replacement design eliminates carburetor re-tuning upon installation

Product Details

• Manufacturer Part Number: 4140 124 2800
• Filter Media Type: Pleated dry panel
• Construction Material: Reinforced cellulose with synthetic binder
• Sealing Component: Integral rubber-infused edge gasket
• Intake Interface: Standard Stihl snap-lock housing pattern

Compatibility

• Stihl MS 271 F-E / MS 291 R-E
• Stihl FS 91 R / FS 111 R
• Stihl K 50 R-FR / K 70
• Equipment manuals explicitly referencing 4140-124-2800 for the primary air intake module

Service intervals depend on ambient particulate concentration; throttle hesitation, black smoke during acceleration, or visible media darkening indicate mandatory replacement. Remove the intake cover, slide out the degraded element, and verify the mating surface seal remains intact before installing the new filter. Do not modify the housing latch mechanism to accommodate alternate brands.