Stihl FS 80 Instruction Manual - Page 39

English / USA Operating Instructions Cleaning the Air Filter During break-in period A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings. During operation After a long period of full-throttle operation, allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air. This protects enginemounted components (ignition, carburetor) from thermal overload. After finishing work Wait for engine to cool down. Drain the fuel tank. Store the machine in a dry place. Check tightness of nuts and screws (not adjusting screws) at regular intervals and retighten as necessary. 2 1 Dirty air filters reduce engine power increase fuel consumption and make starting more difficult. If there is a noticeable loss of engine power : Move choke lever to g. : Press in the tab (1). : Ease the filter cover (2) over the tab and take it away. : Clean away loose dirt from around the filter. : Remove the foam and felt filter elements. 355BA014 KN 2 3 4 5 355BA032 KN : Wash the foam element in a clean, non-flammable cleaning solution (e.g. warm soapy water) and then dry. : Fit new felt element. As a temporary measure you can knock it out on the palm of your hand or blow it out with compressed air. Do not wash. Replace damaged parts! : Install the foam element (3) in the filter cover (2). : Place felt element (4) (lettering facing inward) in filter housing (5). : Fit filter cover so that it snaps into position. 355BA031 KN 38 FS 80, FS 80 R, FS 85, FS 85 R