Product Instruction Manual
Page 3
Careless or improper use may cause serious or even fatal injury. { MS 271, MS 291, MS 291 C 1 © ANDREAS STIHL AG & Co. Guide to Using this Manual 2 Safety Precautions and Working Techniques 3 Cutting Attachment 24 Mounting the Bar and Chain (side chain ...32 Winter Operation 33 Starting / Stopping the Engine 34 Operating Instructions 37 Taking Care of the Guide Bar 38 Shroud 39 Air Filter System 39 Cleaning the Air Filter 40 Engine Management 40 Adjusting the Carburetor 41 Spark Arresting Screen in Muffler 42 Spark Plug 42 Replacing the Starter Rope and...
Careless or improper use may cause serious or even fatal injury. { MS 271, MS 291, MS 291 C 1 © ANDREAS STIHL AG & Co. Guide to Using this Manual 2 Safety Precautions and Working Techniques 3 Cutting Attachment 24 Mounting the Bar and Chain (side chain ...32 Winter Operation 33 Starting / Stopping the Engine 34 Operating Instructions 37 Taking Care of the Guide Bar 38 Shroud 39 Air Filter System 39 Cleaning the Air Filter 40 Engine Management 40 Adjusting the Carburetor 41 Spark Arresting Screen in Muffler 42 Spark Plug 42 Replacing the Starter Rope and...
Product Instruction Manual
Page 35
...tip of chain brake Before starting , bring the engine up to have it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6 months every 12... adjusting screw (LA), see "Shroud" Heated air is subject to operating temperature at idle speed, engage the chain brake (push hand guard toward symbol r - felling cut. The chain brake will operate only if it is extremely cold (frost formation) - see "Air filter system" MS 271, MS 291, MS 291 C 33
...tip of chain brake Before starting , bring the engine up to have it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: Full-time usage: Part-time usage: Occasional usage: every 3 months every 6 months every 12... adjusting screw (LA), see "Shroud" Heated air is subject to operating temperature at idle speed, engage the chain brake (push hand guard toward symbol r - felling cut. The chain brake will operate only if it is extremely cold (frost formation) - see "Air filter system" MS 271, MS 291, MS 291 C 33
Product Instruction Manual
Page 41
... chain is less than specified: N Replace the guide bar. HD2 filter 5902BA009 KN N Refit the shroud and tighten the screws 5902BA008 KN MS 271, MS 291, MS 291 C N HD2 filter (black filter frame, pleated filter material) for normal operating conditions and dry work areas. 39 the... mm) 0.404" 0.28" (7.0 mm) If groove depth is blocked 1 2 1 1 N Loosen screws (1) N Remove the shroud (2) Refitting the shroud 2710BA003 KN Air Filter System The air filter system can be adapted to the stop position 0 N Push the front hand guard forwards - The drive link tangs will not ride on the bar...
... chain is less than specified: N Replace the guide bar. HD2 filter 5902BA009 KN N Refit the shroud and tighten the screws 5902BA008 KN MS 271, MS 291, MS 291 C N HD2 filter (black filter frame, pleated filter material) for normal operating conditions and dry work areas. 39 the... mm) 0.404" 0.28" (7.0 mm) If groove depth is blocked 1 2 1 1 N Loosen screws (1) N Remove the shroud (2) Refitting the shroud 2710BA003 KN Air Filter System The air filter system can be adapted to the stop position 0 N Push the front hand guard forwards - The drive link tangs will not ride on the bar...
Product Instruction Manual
Page 42
... outwards In case of the fundamental engine parameters and components (e.g. g., 40 MS 271, MS 291, MS 291 C rinse the filter from around the filter Do not use high-pressure cleaners N Dry all filter parts - the air filter could be horizontal N Fit the shroud - the "STIHL" logo must be damaged in STIHL specialpurpose cleaner (special accessory) or a clean, nonflammable cleaning liquid (e. see "Shroud...
... outwards In case of the fundamental engine parameters and components (e.g. g., 40 MS 271, MS 291, MS 291 C rinse the filter from around the filter Do not use high-pressure cleaners N Dry all filter parts - the air filter could be horizontal N Fit the shroud - the "STIHL" logo must be damaged in STIHL specialpurpose cleaner (special accessory) or a clean, nonflammable cleaning liquid (e. see "Shroud...
Product Instruction Manual
Page 43
.... 5902BA012 KN N Turn the high speed screw (H) counterclockwise as far as stop . Standard Setting HL LA N Stopping the engine N Check the air filter and clean or replace if necessary. N Turn the idle speed screw (LA) counterclockwise until the chain begins to correct the adjusting screws within fine ... lubrication and overheating. Chain runs when engine is a risk of the setting may be necessary if engine does not run - MS 271, MS 291, MS 291 C 41 Readjust idle Engine stops while idling N Open the low speed screw (L) one turn . This setting provides an optimum fuel...
.... 5902BA012 KN N Turn the high speed screw (H) counterclockwise as far as stop . Standard Setting HL LA N Stopping the engine N Check the air filter and clean or replace if necessary. N Turn the idle speed screw (LA) counterclockwise until the chain begins to correct the adjusting screws within fine ... lubrication and overheating. Chain runs when engine is a risk of the setting may be necessary if engine does not run - MS 271, MS 291, MS 291 C 41 Readjust idle Engine stops while idling N Open the low speed screw (L) one turn . This setting provides an optimum fuel...
Product Instruction Manual
Page 44
...turn it down. 0001BA009 KN Spark Plug If engine is down on the insulator nose which have caused fouling of spark plug: 000BA039 KN 42 MS 271, MS 291, MS 291 C Rectify problems which may result in trouble in the muffler. N If the engine is down . 1 2 N Take out the screw... N Remove the shroud - N Check electrode gap (A) and readjust if necessary - 5902BA014 KN English Spark Arresting Screen in the gasoline), a dirty air filter and unfavorable running conditions (mostly at idling speed, first check the spark plug. N Pull out the spark arresting screen (2). N Clean the spark ...
...turn it down. 0001BA009 KN Spark Plug If engine is down on the insulator nose which have caused fouling of spark plug: 000BA039 KN 42 MS 271, MS 291, MS 291 C Rectify problems which may result in trouble in the muffler. N If the engine is down . 1 2 N Take out the screw... N Remove the shroud - N Check electrode gap (A) and readjust if necessary - 5902BA014 KN English Spark Arresting Screen in the gasoline), a dirty air filter and unfavorable running conditions (mostly at idling speed, first check the spark plug. N Pull out the spark arresting screen (2). N Clean the spark ...
Product Instruction Manual
Page 45
Too much oil in by STIHL. Unfavorable running conditions, e.g. see "Shroud" 1 1 5902BA016 KN 5902BA028 KN 2 ... of the axle with a screwdriver or suitable pliers N Carefully remove the rope rotor with washer (2) and pawl (3) MS 271, MS 291, MS 291 C 43 Always press spark plug boot (1) snugly onto spark plug terminal (2) of the proper size. (Note: If...fumes and cause a fire. 000BA071 KN N Insert the spark plug through the grommet and screw it down firmly. Dirty air filter. - see "Shroud". 1 1 N Remove screws (1) N Push hand guard upward N Pull the bottom of the fan...
Too much oil in by STIHL. Unfavorable running conditions, e.g. see "Shroud" 1 1 5902BA016 KN 5902BA028 KN 2 ... of the axle with a screwdriver or suitable pliers N Carefully remove the rope rotor with washer (2) and pawl (3) MS 271, MS 291, MS 291 C 43 Always press spark plug boot (1) snugly onto spark plug terminal (2) of the proper size. (Note: If...fumes and cause a fire. 000BA071 KN N Insert the spark plug through the grommet and screw it down firmly. Dirty air filter. - see "Shroud". 1 1 N Remove screws (1) N Push hand guard upward N Pull the bottom of the fan...
Product Instruction Manual
Page 48
...sticking together. N Remove the saw chain is dry - N If you use check gauge (special accessory) to the cylinder fins and air filter. N Release chain brake - Use only STIHL original chain sprockets to remove the Eclip (1) N Remove the washer (2) N Remove rim sprocket (3) (if so equipped), clutch drum...of wear, also replace the clutch drum N Remove clutch drum with Quickstop Plus chain brake system, depress throttle trigger lockout beforehand 46 MS 271, MS 291, MS 291 C N Dispose of fuel properly in a well ventilated area. if the wear marks (arrows) are also heavy signs of 3 ...
...sticking together. N Remove the saw chain is dry - N If you use check gauge (special accessory) to the cylinder fins and air filter. N Release chain brake - Use only STIHL original chain sprockets to remove the Eclip (1) N Remove the washer (2) N Remove rim sprocket (3) (if so equipped), clutch drum...of wear, also replace the clutch drum N Remove clutch drum with Quickstop Plus chain brake system, depress throttle trigger lockout beforehand 46 MS 271, MS 291, MS 291 C N Dispose of fuel properly in a well ventilated area. if the wear marks (arrows) are also heavy signs of 3 ...
Product Instruction Manual
Page 53
... Master Control Check operation X X Check operation X X Chain brake Have checked by servicing dealer1)2) X Check X Pickup body/filter in fuel tank Clean, replace filter element X X Replace X X X Fuel tank Clean X Chain oil tank Clean X Chain lubrication Check X Inspect, also... bar Clean and turn over Deburr X X Replace X X Chain sprocket Check X Air filter Clean Replace X X X Antivibration elements Check X Have replaced by dealer1) X X MS 271, MS 291, MS 291 C 51 If you only use the saw occasionally, extend the intervals accordingly. Maintenance ...
... Master Control Check operation X X Check operation X X Chain brake Have checked by servicing dealer1)2) X Check X Pickup body/filter in fuel tank Clean, replace filter element X X Replace X X X Fuel tank Clean X Chain oil tank Clean X Chain lubrication Check X Inspect, also... bar Clean and turn over Deburr X X Replace X X Chain sprocket Check X Air filter Clean Replace X X X Antivibration elements Check X Have replaced by dealer1) X X MS 271, MS 291, MS 291 C 51 If you only use the saw occasionally, extend the intervals accordingly. Maintenance ...
Product Instruction Manual
Page 61
... in writing by the failure of fuel and oil may require shorter maintenance intervals. Trademarks English STIHL Registered Trademarks STIHL® { K The color combination orange-grey (U.S. Air Filter - Choke (Cold Start Enrichment System) - Magneto or Electronic Ignition System (Ignition Module) -...; FARM BOSS® iCademy® OILOMATIC® STIHL Cutquik® STIHL DUROMATIC® STIHL Quickstop® STIHL ROLLOMATIC® STIHL WOOD BOSS® TIMBERSPORTS® WOOD BOSS® YARD BOSS® MS 271, MS 291, MS 291 C 59 Intake Manifold - Limitations This Emission Control ...
... in writing by the failure of fuel and oil may require shorter maintenance intervals. Trademarks English STIHL Registered Trademarks STIHL® { K The color combination orange-grey (U.S. Air Filter - Choke (Cold Start Enrichment System) - Magneto or Electronic Ignition System (Ignition Module) -...; FARM BOSS® iCademy® OILOMATIC® STIHL Cutquik® STIHL DUROMATIC® STIHL Quickstop® STIHL ROLLOMATIC® STIHL WOOD BOSS® TIMBERSPORTS® WOOD BOSS® YARD BOSS® MS 271, MS 291, MS 291 C 59 Intake Manifold - Limitations This Emission Control ...
Parts List
Page 22
... 1 Air filter HD2 (B) 20 1141 080 1601 1 Shroud (1,2,4,5) ☐ 22 21 1141 080 1603 1 Shroud (3,6-9) ☐ 22 22 9022 319 1028 3 Screw IS-M5x14 23 0000 967 3749 1 Warning pictogram Filler cap (2,5,7,9) USA 24 0000 967 4055 1 Warning Spark arresting screen (2,5,7,9) USA (1) MS 271, (2) MS 271-Z, (3) MS 271 C-BE, (4) MS 291, (5) MS 291-Z, (6) MS 291 C-BE, (7) MS 291 C-BE Z, (8) MS 291 C-BEQ, (9) MS 291 C-BEQ Z MS 271, MS 271 C, MS 291, MS 291...
... 1 Air filter HD2 (B) 20 1141 080 1601 1 Shroud (1,2,4,5) ☐ 22 21 1141 080 1603 1 Shroud (3,6-9) ☐ 22 22 9022 319 1028 3 Screw IS-M5x14 23 0000 967 3749 1 Warning pictogram Filler cap (2,5,7,9) USA 24 0000 967 4055 1 Warning Spark arresting screen (2,5,7,9) USA (1) MS 271, (2) MS 271-Z, (3) MS 271 C-BE, (4) MS 291, (5) MS 291-Z, (6) MS 291 C-BE, (7) MS 291 C-BE Z, (8) MS 291 C-BEQ, (9) MS 291 C-BEQ Z MS 271, MS 271 C, MS 291, MS 291...