Stihl MS 291 Product Instruction Manual - Page 42

English Cleaning the Air Filter If there is a noticeable loss of engine power N Remove the shroud - see "Shroud" Remove air filter N Clean away loose dirt from around the filter Do not use tools to remove and install the air filter - the air filter could be damaged in the process. 1. 2. warm soapy water) - rinse the filter from inside to out under a water jet - do not use high-pressure cleaners N Dry all filter parts - do not expose to extreme heat Installing the air filter 1. 2. N Fit air filter N Press the air filter in the direction of the filter housing and simultaneously turn it clockwise until the air filter engages - the "STIHL" logo must be horizontal N Fit the shroud - see "Shroud" Engine Management Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware. 2710BA000 KN 2710BA001 KN N Turn air filter 1/4 turn counterclockwise and remove in the direction of the rear handle N Always replace a damaged filter Cleaning the air filter N Knock out the filter or blow it clear with compressed air from the inside outwards In case of stubborn dirt or stuck filter fabric N Wash the filter in STIHL specialpurpose cleaner (special accessory) or a clean, nonflammable cleaning liquid (e. g., 40 MS 271, MS 291, MS 291 C