STIHL Air Filter - 4149 120 1800

Key Features

• Direct replacement for factory-stamped STIHL chassis air intake components
• Multi-stage filtration combining a coarse polyurethane foam pre-filter with a precision pleated cellulose main element
• Optimized pore distribution to capture abrasive wood particulate while maintaining specified volumetric airflow
• Reinforced molded housing with alignment keys and standardized gasket channel for consistent seal retention
• Fabricated to OEM dimensional tolerances, requiring no drilling or adapter hardware during installation

Product Details

• Manufacturer: STIHL
• Part Number: 4149 120 1800
• Assembly Classification: Primary air filter and pre-filter unit
• Media Composition: Porous PU foam base bonded to pleated treated paper core
• Retention Mechanism: Four-point clip-and-bolt mounting interface matching original clutch cover brackets
• Maintenance Protocol: Wash foam pre-filter in approved solvent, inspect pleats for collapse or tearing, and replace full assembly when flow restriction exceeds baseline specifications

Compatibility

• Chainsaw Platform: STIHL MS 250, MS 270, MS 362
• Cutting & Trimming Tools: FS 120 R, FS 160 R, FS 210 C, FS 211 S, FS 260 C, FS 360 R, FE 260
• Agricultural/Electric Systems: HL 98 C-E, KR 81 R, SR 46
• KombiSystem Chassis: KM 56 R, KM 56 RM, KM 56 RK, KM 70 R, KM 70 RM, KM 70 RK
• Installation Verification: Confirm host unit serial prefix and drive sprocket cover labeling prior to mounting.