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.