Product Instruction Manual
Page 3
... is a high-speed wood-cutting tool, some special safety precautions must be made from your STIHL chain saw differs from those described in Muffler 38 Spark Plug 39 Replacing the Starter Rope and Rewind Spring 40 Storing the Machine 42 Checking... Accessories Ordering Spare Parts Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement Trademarks MS 311, MS 391 English 49 Allow only persons who fully understand 51 this manual, please contact your STIHL dealer for your STIHL dealer or the STIHL distributor for information and assistance. 1 Warning...
... is a high-speed wood-cutting tool, some special safety precautions must be made from your STIHL chain saw differs from those described in Muffler 38 Spark Plug 39 Replacing the Starter Rope and Rewind Spring 40 Storing the Machine 42 Checking... Accessories Ordering Spare Parts Maintenance and Repairs STIHL Incorporated Federal Emission Control Warranty Statement Trademarks MS 311, MS 391 English 49 Allow only persons who fully understand 51 this manual, please contact your STIHL dealer for your STIHL dealer or the STIHL distributor for information and assistance. 1 Warning...
Product Instruction Manual
Page 6
...apparel. 4 Clothing must be extremely dangerous. This field may interfere with nonslip soles. Wear sound barriers (ear plugs or ear mufflers) to your hands. Continual and regular users should consult their hearing checked regularly. Be particularly alert and cautious when wearing hearing ...(shouts, alarms, etc.) is restricted. Chain saw chain sharp. Only attachments supplied by STIHL or expressly approved by STIHL for which it is subjected to your face STIHL recommends that MS 311, MS 391 If any way. Maintain a firm grip at all times, but allow complete freedom of...
...apparel. 4 Clothing must be extremely dangerous. This field may interfere with nonslip soles. Wear sound barriers (ear plugs or ear mufflers) to your hands. Continual and regular users should consult their hearing checked regularly. Be particularly alert and cautious when wearing hearing ...(shouts, alarms, etc.) is restricted. Chain saw chain sharp. Only attachments supplied by STIHL or expressly approved by STIHL for which it is subjected to your face STIHL recommends that MS 311, MS 391 If any way. Maintain a firm grip at all times, but allow complete freedom of...
Product Instruction Manual
Page 7
...power tool. Take care not to get fuel on the fuel used, the weather conditions and the tank venting system. Keep the hot muffler away from saw chain moving. Note that combustible fuel vapor may build up in a horizontal position. Never remove the fuel filler cap ..., MS 391 5 Do not continue operating this happens, change your instruction manual). THE USE OF THE POWER TOOL Transporting the Power Tool Warning! Always engage the chain brake when taking more than a few steps. Fuel Your STIHL power tool uses an oilgasoline mixture for fuel leakage while refueling and...
...power tool. Take care not to get fuel on the fuel used, the weather conditions and the tank venting system. Keep the hot muffler away from saw chain moving. Note that combustible fuel vapor may build up in a horizontal position. Never remove the fuel filler cap ..., MS 391 5 Do not continue operating this happens, change your instruction manual). THE USE OF THE POWER TOOL Transporting the Power Tool Warning! Always engage the chain brake when taking more than a few steps. Fuel Your STIHL power tool uses an oilgasoline mixture for fuel leakage while refueling and...
Product Instruction Manual
Page 12
... breakage or excessive wear. Warning! You may be damaged or removed. This may be cutting asbestos, immediately contact your STIHL servicing dealer only. 10 MS 311, MS 391 It can result in the cut or the chain brake is idling. Your chain saw chain moving while the engine is...fins of a thrown or broken chain. Breathing asbestos dust is designed to whether the antivibration elements should always be replaced, consult your muffler. Antivibration elements should be replaced in the event of the cylinder, spark plug) become hot during normal operation may result in heat ...
... breakage or excessive wear. Warning! You may be damaged or removed. This may be cutting asbestos, immediately contact your STIHL servicing dealer only. 10 MS 311, MS 391 It can result in the cut or the chain brake is idling. Your chain saw chain moving while the engine is...fins of a thrown or broken chain. Breathing asbestos dust is designed to whether the antivibration elements should always be replaced, consult your muffler. Antivibration elements should be replaced in the event of the cylinder, spark plug) become hot during normal operation may result in heat ...
Product Instruction Manual
Page 13
... reactive forces are equipped with screens designed to cut . This may help you suspect a clogged screen, have your power tool down in the muffler. Under some cutting circumstances the bar moves towards the operator, who may occur, for example, when the chain near the upper quadrant of fire..., MS 391 11 stay clean and need no service or maintenance. Sudden surprise contributes to reduce the exhaust emissions of the bar. pull-in the plane of the engine by a STIHL servicing dealer. If you experience loss of performance and you avoid the element of surprise and loss of fire ...
... reactive forces are equipped with screens designed to cut . This may help you suspect a clogged screen, have your power tool down in the muffler. Under some cutting circumstances the bar moves towards the operator, who may occur, for example, when the chain near the upper quadrant of fire..., MS 391 11 stay clean and need no service or maintenance. Sudden surprise contributes to reduce the exhaust emissions of the bar. pull-in the plane of the engine by a STIHL servicing dealer. If you experience loss of performance and you avoid the element of surprise and loss of fire ...
Product Instruction Manual
Page 24
...or with a spark-arresting screen to properly perform its operating characteristics. twice a year, Occasional usage - The chain saw if the muffler is engaged. Before storing for maintenance whenever the brake system cannot be thoroughly cleaned or there is a change in its function of ...which may cause a fire. For these reasons, each STIHL chain saw in the instruction manual). 22 MS 311, MS 391 Always press spark plug boot snugly onto spark plug terminal of fire and hearing loss. Warning! An improperly maintained muffler will increase the risk of the proper size. (Note...
...or with a spark-arresting screen to properly perform its operating characteristics. twice a year, Occasional usage - The chain saw if the muffler is engaged. Before storing for maintenance whenever the brake system cannot be thoroughly cleaned or there is a change in its function of ...which may cause a fire. For these reasons, each STIHL chain saw in the instruction manual). 22 MS 311, MS 391 Always press spark plug boot snugly onto spark plug terminal of fire and hearing loss. Warning! An improperly maintained muffler will increase the risk of the proper size. (Note...
Product Instruction Manual
Page 39
... major hardware. N Check the spark arresting screen (country-specific) in the muffler and clean or replace if necessary. 37 carburation, ignition, timing and valve or port timing) without the addition of the fundamental engine parameters and components (e.g. Standard setting MS 311, MS 391 LA N Shut off the engine N Check the air filter and clean...
... major hardware. N Check the spark arresting screen (country-specific) in the muffler and clean or replace if necessary. 37 carburation, ignition, timing and valve or port timing) without the addition of the fundamental engine parameters and components (e.g. Standard setting MS 311, MS 391 LA N Shut off the engine N Check the air filter and clean...
Product Instruction Manual
Page 40
...(L) 1/8 of the idle speed screw (LA) after every correction to run - If the setting is too lean there is down . 0001BA009 KN 38 MS 311, MS 391 N If the engine is a risk of the setting may be necessary if the engine does not run satisfactorily: N Turn high speed screw (H) clockwise ...low speed screw (L) one . N Turn the idle speed screw (LA) counterclockwise until the chain begins to the low speed screw (L). Fine tuning for the muffler to change the setting of a turn . N Pull out the spark arresting screen (2). then back it another 1 1/2 turns in the same direction. It ...
...(L) 1/8 of the idle speed screw (LA) after every correction to run - If the setting is too lean there is down . 0001BA009 KN 38 MS 311, MS 391 N If the engine is a risk of the setting may be necessary if the engine does not run satisfactorily: N Turn high speed screw (H) clockwise ...low speed screw (L) one . N Turn the idle speed screw (LA) counterclockwise until the chain begins to the low speed screw (L). Fine tuning for the muffler to change the setting of a turn . N Pull out the spark arresting screen (2). then back it another 1 1/2 turns in the same direction. It ...
Product Instruction Manual
Page 50
... muffler Check Clean or replace Combustion chamber Decoke after first 139 hours of operating, then every 150 hours Check X Chain catcher Replace Safety labels Replace 1) STIHL recommends a STIHL servicing dealer. 2) see chapter on "Chain Brake" 3) Firmly tighten down the cylinder base screws of operation. 4) not in all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 If...
... muffler Check Clean or replace Combustion chamber Decoke after first 139 hours of operating, then every 150 hours Check X Chain catcher Replace Safety labels Replace 1) STIHL recommends a STIHL servicing dealer. 2) see chapter on "Chain Brake" 3) Firmly tighten down the cylinder base screws of operation. 4) not in all versions, market-specific X X X X X X X X X X 48 MS 311, MS 391 If...
Product Instruction Manual
Page 51
... Sprocket 8 Chain Sprocket Cover 9 Chain Catcher 10 Side Chain Tensioner 11 Bumper Spike 12 Guide Bar 13 Oilomatic Saw Chain 14 Oil Filler Cap 15 Muffler (with Spark Arresting Screen, not Fitted on all Markets) 16 Front Hand Guard 17 Front Handle (Handlebar) 18 Starter Grip 19 Fuel Filler Cap 20...
... Sprocket 8 Chain Sprocket Cover 9 Chain Catcher 10 Side Chain Tensioner 11 Bumper Spike 12 Guide Bar 13 Oilomatic Saw Chain 14 Oil Filler Cap 15 Muffler (with Spark Arresting Screen, not Fitted on all Markets) 16 Front Hand Guard 17 Front Handle (Handlebar) 18 Starter Grip 19 Fuel Filler Cap 20...
Product Instruction Manual
Page 52
... the transmission of the pull starter, for starting the engine. 19 Fuel Filler Cap For closing the oil tank. 15 Muffler (with the ignition lead. 4 Shutter (Summer and Winter Operation) With summer and winter positions. It also serves as ...tuning the carburetor. 3 Spark Plug Boot Connects the spark plug with Spark Arresting Screen, not Fitted on all Markets) Muffler reduces engine exhaust noise and diverts exhaust gases away from touching the chain if it breaks or comes off the bar.... contact by the engine and cutting attachment to the operator's hands. (not illustrated) 50 MS 311, MS 391
... the transmission of the pull starter, for starting the engine. 19 Fuel Filler Cap For closing the oil tank. 15 Muffler (with the ignition lead. 4 Shutter (Summer and Winter Operation) With summer and winter positions. It also serves as ...tuning the carburetor. 3 Spark Plug Boot Connects the spark plug with Spark Arresting Screen, not Fitted on all Markets) Muffler reduces engine exhaust noise and diverts exhaust gases away from touching the chain if it breaks or comes off the bar.... contact by the engine and cutting attachment to the operator's hands. (not illustrated) 50 MS 311, MS 391
Parts Diagram
Page 4
... Plug 1 spark arresting screen (2,4) 1 Self-tapping screw M4x9.6 (2,4) 2 Spline screw IS-M5x16 1 Tube of sealant Dirko HT red (B) (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 4 SCS 01-2010 3.29 Drawing B Cylinder, Muffler Reference Item number 1 1140 020 1201 2 1140 020 1202 3 1140 030 2002 4 1140 034 3000 5 1122 034 1500 6 9463 650 1200... 1 Decompression valve 1 Crankshaft (25.2005) 2 Grooved ball bearing 15x38x11 2 Oil seal 15x25x5 2 Oil seal 15x25x5 (B) (24.96),(39.90) 1 Circlip 15x1 1 Muffler gasket 1 Muffler (1,3) ☐ 20 1 Muffler (2,4) USDA Cert.
... Plug 1 spark arresting screen (2,4) 1 Self-tapping screw M4x9.6 (2,4) 2 Spline screw IS-M5x16 1 Tube of sealant Dirko HT red (B) (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 4 SCS 01-2010 3.29 Drawing B Cylinder, Muffler Reference Item number 1 1140 020 1201 2 1140 020 1202 3 1140 030 2002 4 1140 034 3000 5 1122 034 1500 6 9463 650 1200... 1 Decompression valve 1 Crankshaft (25.2005) 2 Grooved ball bearing 15x38x11 2 Oil seal 15x25x5 2 Oil seal 15x25x5 (B) (24.96),(39.90) 1 Circlip 15x1 1 Muffler gasket 1 Muffler (1,3) ☐ 20 1 Muffler (2,4) USDA Cert.
