Air Filter & Air Filter Base Intake Baffle — Fits STIHL MS661 (Replacement Part No. 1144 140 1200) Key benefits Protects the engine by trapping dust, sawdust, and debris before they reach the carburetor and cylinder, helping maintain power and prolong engine life. Durable construction resists damage and deformation during installation and routine use, reducing the need for frequent replacements. Directfit replacement for STIHL MS661 using official Replacement Part Number 1144 140 1200 for quick, reliable installation and correct alignment. What this part does The air filter captures particles that would otherwise contaminate the engine. The air filter base intake baffle secures the filter and directs airflow to preserve consistent engine performance and efficient combustion. Compatibility and specifications Compatible model: STIHL MS661 chainsaw. Replacement Part Number: 1144 140 1200 (use this number to confirm fit with your machine). Material: quality, durable materials designed to resist damage and maintain shape under normal operating conditions. What's included Package includes the air filter and the air filter base intake baffle (as shown in product images). Performance and installation Designed for straightforward replacement—matches the original fit and mounting points to make maintenance fast and simple. Regular replacement keeps air intake clear, stabilizes idle and throttle response, and helps prevent costly engine repairs caused by contamination. Practical use scenarios Routine maintenance: the air filter assembly during scheduled service intervals to maintain peak cutting performance and fuel efficiency. Heavy dust or debris environments: Ideal when working in sawmills, construction sites, or storm cleanup where airborne particles are common. Professional use: Suitable for arborists and forestry professionals who need dependable filtration to protect performance engines used daily. Why choose this part Specifically matched to STIHL MS661 to ensure proper function and fit. Durable build reduces downtime and replacement frequency. Clear replacement part number (1144 140 1200) makes ordering and verification simple. Installation tip Follow STIHL's maintenance instructions for filter replacement and inspect the airbox and intake for excess debris each time you change the filter. Ensure the sealing surfaces are clean and seated correctly to prevent unfiltered air bypass.