Product Instruction Manual
Page 4
...is a high-speed, fast-cutting power tool, special safety precautions must be covered in severe or fatal injury. N Lever (2) ... Indicates a hazardous situation ... manual may cause serious or fatal injury. Engineering Improvements STIHL's philosophy is important that are generally observed when working with...your power tool. Symbols in this manual, please contact your STIHL dealer show you read, fully understand and observe the following safety...without direct reference to the machine or its products. Have your STIHL dealer for instance, refer to time. All safety precautions that ...
...is a high-speed, fast-cutting power tool, special safety precautions must be covered in severe or fatal injury. N Lever (2) ... Indicates a hazardous situation ... manual may cause serious or fatal injury. Engineering Improvements STIHL's philosophy is important that are generally observed when working with...your power tool. Symbols in this manual, please contact your STIHL dealer show you read, fully understand and observe the following safety...without direct reference to the machine or its products. Have your STIHL dealer for instance, refer to time. All safety precautions that ...
Product Instruction Manual
Page 8
The screwdriver end of the STIHL combination wrench or other in gauge and pitch. Proper tension of fire and burn injuries, start the saw with the sprocket cover loose. Keep the handles clean and dry at regular intervals (whenever the saw without assistance. The throttle trigger must...engine is extremely important. Warning! To reduce the risk of the chain is running! In order to keep them free of injury. 6 MS 311, MS 391 If the chain becomes loose while cutting, shut off the chain guard (scabbard) and inspect the saw kickback standard" below. it is...
The screwdriver end of the STIHL combination wrench or other in gauge and pitch. Proper tension of fire and burn injuries, start the saw with the sprocket cover loose. Keep the handles clean and dry at regular intervals (whenever the saw without assistance. The throttle trigger must...engine is extremely important. Warning! To reduce the risk of the chain is running! In order to keep them free of injury. 6 MS 311, MS 391 If the chain becomes loose while cutting, shut off the chain guard (scabbard) and inspect the saw kickback standard" below. it is...
Product Instruction Manual
Page 25
...audible click - start at the bar nose. 143BA003 KN MS 311, MS 391 23 A cutting attachment consists of the guide bar (3). Mounting the Bar and Chain Removing the chain sprocket cover 1 2 N Unscrew the nuts and take off the chain sprocket cover. 143BA034 KN English Disengaging the chain brake. The cutting ...of the housing slot. 001BA185 KN Wear work gloves to exactly match the chain saw chains and chain sprockets. Cutting Attachment STIHL is the only manufacturer in the industry to produce its own chain saws, guide bars, saw . Fitting the chain 001BA186 KN 001BA191 ...
...audible click - start at the bar nose. 143BA003 KN MS 311, MS 391 23 A cutting attachment consists of the guide bar (3). Mounting the Bar and Chain Removing the chain sprocket cover 1 2 N Unscrew the nuts and take off the chain sprocket cover. 143BA034 KN English Disengaging the chain brake. The cutting ...of the housing slot. 001BA185 KN Wear work gloves to exactly match the chain saw chains and chain sprockets. Cutting Attachment STIHL is the only manufacturer in the industry to produce its own chain saws, guide bars, saw . Fitting the chain 001BA186 KN 001BA191 ...
Product Instruction Manual
Page 26
... hand. N Loosen the nuts. N Hold the bar nose up , tighten down the nuts firmly. N Shut off the engine. N Refit the sprocket cover and screw on "Operating Instructions". N Use a screwdriver to turn the tensioning screw (1) clockwise until there is very little chain sag on the top of...be retensioned more often than one that has been in the locating hole (2) -- A new chain has to chapter on "Operating Instructions". 24 MS 311, MS 391 place the chain over the studs (1) - and the drive link tangs are engaged in use for some time. N Go to be retensioned more...
... hand. N Loosen the nuts. N Hold the bar nose up , tighten down the nuts firmly. N Shut off the engine. N Refit the sprocket cover and screw on "Operating Instructions". N Use a screwdriver to turn the tensioning screw (1) clockwise until there is very little chain sag on the top of...be retensioned more often than one that has been in the locating hole (2) -- A new chain has to chapter on "Operating Instructions". 24 MS 311, MS 391 place the chain over the studs (1) - and the drive link tangs are engaged in use for some time. N Go to be retensioned more...
Product Instruction Manual
Page 32
engine off Operating position F - the Master Control lever returns to use of the cover plate is for starting the cold engine 30 MS 311, MS 391 When the cover plate is squeezed Cold start n - this position is recommended to the operating position when the throttle trigger is used..., the slide must be in the winter position. If engine trouble occurs, first check whether use the "cover plate mounting ...
engine off Operating position F - the Master Control lever returns to use of the cover plate is for starting the cold engine 30 MS 311, MS 391 When the cover plate is squeezed Cold start n - this position is recommended to the operating position when the throttle trigger is used..., the slide must be in the winter position. If engine trouble occurs, first check whether use the "cover plate mounting ...
Product Instruction Manual
Page 45
..., MS 391 43 use of wear, also replace the clutch drum N Remove clutch drum or spur chain sprocket (5) including needle cage (6) from the crankshaft - Checking and Replacing the Chain Sprocket N Remove chain sprocket cover, saw chain is reduced - if the wear marks (arrows) are also heavy signs ... to test Using two saw chains or earlier - if there are deeper than 0.02 in alternation helps preserve the chain sprocket. Use only STIHL original chain sprockets to ensure reliable functioning of the saw chain and guide bar. cavities toward the outside N Refit washer and E-clip on ...
..., MS 391 43 use of wear, also replace the clutch drum N Remove clutch drum or spur chain sprocket (5) including needle cage (6) from the crankshaft - Checking and Replacing the Chain Sprocket N Remove chain sprocket cover, saw chain is reduced - if the wear marks (arrows) are also heavy signs ... to test Using two saw chains or earlier - if there are deeper than 0.02 in alternation helps preserve the chain sprocket. Use only STIHL original chain sprockets to ensure reliable functioning of the saw chain and guide bar. cavities toward the outside N Refit washer and E-clip on ...
Product Instruction Manual
Page 51
... 24 English 1 Shroud Lock 2 Carburetor Adjusting Screws 3 Spark Plug Boot 4 Shutter (Summer and Winter Operation) 5 Decompression Valve (Automatically Resetting) 6 Chain Brake 7 Chain 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... Fuel Filler Cap 20 Master Control Lever 21 Throttle Trigger 22 Throttle Trigger Lockout 23 Rear Handle 24 Rear Hand Guard # Serial Number 4903BA003 KN MS 311, MS 391 49
... 24 English 1 Shroud Lock 2 Carburetor Adjusting Screws 3 Spark Plug Boot 4 Shutter (Summer and Winter Operation) 5 Decompression Valve (Automatically Resetting) 6 Chain Brake 7 Chain 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... Fuel Filler Cap 20 Master Control Lever 21 Throttle Trigger 22 Throttle Trigger Lockout 23 Rear Handle 24 Rear Hand Guard # Serial Number 4903BA003 KN MS 311, MS 391 49
Product Instruction Manual
Page 52
.... 23 Rear Handle The support handle for the right hand, located at the front of the saw chain. 8 Chain Sprocket Cover Covers the clutch and chain sprocket. 9 Chain Catcher Helps to reduce the risk of operator contact by the engine and cutting attachment ...) Anti-Vibration System The anti-vibration system includes a number of anti-vibration elements designed to the operator's hands. (not illustrated) 50 MS 311, MS 391 Is activated in winter position. 5 Decompression Valve (Automatically Resetting) Releases compression pressure to operator's right hand. Carburetor is heated in a ...
.... 23 Rear Handle The support handle for the right hand, located at the front of the saw chain. 8 Chain Sprocket Cover Covers the clutch and chain sprocket. 9 Chain Catcher Helps to reduce the risk of operator contact by the engine and cutting attachment ...) Anti-Vibration System The anti-vibration system includes a number of anti-vibration elements designed to the operator's hands. (not illustrated) 50 MS 311, MS 391 Is activated in winter position. 5 Decompression Valve (Automatically Resetting) Releases compression pressure to operator's right hand. Carburetor is heated in a ...
Product Instruction Manual
Page 54
Special Accessories Contact your STIHL dealer for information regarding special accessories that fit onto one tab and in accordance with the saw or is necessary. Chain scabbard If you use ... the bar to help reduce the risk of locking tabs (2, 3, 4) located on this Manual, ask your STIHL dealer for the latest STIHL recommendations. Depending on the other. 52 MS 311, MS 391 If the chain scabbard does not cover the full length of this specific engine unit, or have been designated as meeting the ANSI Sec...
Special Accessories Contact your STIHL dealer for information regarding special accessories that fit onto one tab and in accordance with the saw or is necessary. Chain scabbard If you use ... the bar to help reduce the risk of locking tabs (2, 3, 4) located on this Manual, ask your STIHL dealer for the latest STIHL recommendations. Depending on the other. 52 MS 311, MS 391 If the chain scabbard does not cover the full length of this specific engine unit, or have been designated as meeting the ANSI Sec...
Product Instruction Manual
Page 56
... center as soon as the owner, shall not be provided without charge to STIHL Inc., 536 Viking Drive, P.O. Diagnosis You, as a problem exists. However, if you retain all receipts covering maintenance on emission-related parts and must be charged for the cost of charge. The warranty...warranted part is scheduled only for presenting your engine is liable for replacement as required maintenance, or which is not scheduled for 54 MS 311, MS 391 Any such work will begin on your small off -road equipment engine will be completed in a reasonable amount of the required ...
... center as soon as the owner, shall not be provided without charge to STIHL Inc., 536 Viking Drive, P.O. Diagnosis You, as a problem exists. However, if you retain all receipts covering maintenance on emission-related parts and must be charged for the cost of charge. The warranty...warranted part is scheduled only for presenting your engine is liable for replacement as required maintenance, or which is not scheduled for 54 MS 311, MS 391 Any such work will begin on your small off -road equipment engine will be completed in a reasonable amount of the required ...
Product Instruction Manual
Page 57
... Emission Control Systems Warranty shall not cover any authorized STIHL servicing dealer and present the signed warranty card. Choke (Cold Start Enrichment System) - Fuel Cap - Deviations from this manual are based on the application of the recommended 2-stroke fuel-oil MS 311, MS 391 55 Trademarks English STIHL Registered Trademarks STIHL® { K The color combination orange-grey...
... Emission Control Systems Warranty shall not cover any authorized STIHL servicing dealer and present the signed warranty card. Choke (Cold Start Enrichment System) - Fuel Cap - Deviations from this manual are based on the application of the recommended 2-stroke fuel-oil MS 311, MS 391 55 Trademarks English STIHL Registered Trademarks STIHL® { K The color combination orange-grey...
Parts Diagram
Page 2
... ☐ 19, 20 19 1 Spur gear (D) 20 1 Adjusting screw (D) 21 1127 640 1900 1 Tensioner slide 22 1123 664 1400 1 Thrust pad 23 1127 664 2200 1 Cover 24 9074 478 3005 1 Pan head self-tapping screw IS-P4x14 (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 2 SCS 01-2010 3.29
... ☐ 19, 20 19 1 Spur gear (D) 20 1 Adjusting screw (D) 21 1127 640 1900 1 Tensioner slide 22 1123 664 1400 1 Thrust pad 23 1127 664 2200 1 Cover 24 9074 478 3005 1 Pan head self-tapping screw IS-P4x14 (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 2 SCS 01-2010 3.29
Parts Diagram
Page 6
... 1127 162 3200 1 Carrier 15 1125 162 0802 3 Clutch shoe 16 1127 162 3000 3 Retainer 17 0000 997 0911 3 Tension spring 18 1127 162 1000 1 Cover washer 19 9512 933 2260 1 Needle cage 10x13x10 20 1140 640 2000 1 Chain sprocket 3/8" 7T 21 0000 958 1021 1 Washer Ø 33 mm 22 9460... 1 Rim sprocket 0.325" 8T (B) 1125 007 1001 1 Rim sprocket kit 0.325" 7T (B) ☐ 22, 24, 25, 27 27 0000 642 1236 1 Rim sprocket 0.325" 7T (B) (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 6 SCS 01-2010 3.29
... 1127 162 3200 1 Carrier 15 1125 162 0802 3 Clutch shoe 16 1127 162 3000 3 Retainer 17 0000 997 0911 3 Tension spring 18 1127 162 1000 1 Cover washer 19 9512 933 2260 1 Needle cage 10x13x10 20 1140 640 2000 1 Chain sprocket 3/8" 7T 21 0000 958 1021 1 Washer Ø 33 mm 22 9460... 1 Rim sprocket 0.325" 8T (B) 1125 007 1001 1 Rim sprocket kit 0.325" 7T (B) ☐ 22, 24, 25, 27 27 0000 642 1236 1 Rim sprocket 0.325" 7T (B) (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 6 SCS 01-2010 3.29
Parts Diagram
Page 8
... mm / 1 3/16'' 1 Cover 2 Pan head self-tapping screw IS-P5x16 1 Bumper spike 2 Pan head self-tapping screw IS-P5x16 2 Bumper strip 1 Chain sprocket cover ☐ 19 2 Bumper strip 2 Hexagon nut M8 1 Bumper spike (B) ☐ 22, 23 2 Lock nut M5 (B) 2 Hexagon head screw M5x12 (B) 1 Instruction label USA (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 8 SCS 01-2010...
... mm / 1 3/16'' 1 Cover 2 Pan head self-tapping screw IS-P5x16 1 Bumper spike 2 Pan head self-tapping screw IS-P5x16 2 Bumper strip 1 Chain sprocket cover ☐ 19 2 Bumper strip 2 Hexagon nut M8 1 Bumper spike (B) ☐ 22, 23 2 Lock nut M5 (B) 2 Hexagon head screw M5x12 (B) 1 Instruction label USA (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 8 SCS 01-2010...
Parts Diagram
Page 12
... grip 1 Starter rope Ø 3.5x960 mm 1 Starter rope Ø 3.5 mm x 30.5 m (A,B) 1 Model plate MS 311 (1,2) 1 Model plate MS 391 (3,4) 3 Pan head self-tapping screw IS-P5x20 14 1140 007 1003 1 Cover plate kit (B) ☐ 15 15 9074 477 2995 2 Pan head self-tapping screw IS-P4x12 (B) (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 12 SCS 01-2010 3.29
... grip 1 Starter rope Ø 3.5x960 mm 1 Starter rope Ø 3.5 mm x 30.5 m (A,B) 1 Model plate MS 311 (1,2) 1 Model plate MS 391 (3,4) 3 Pan head self-tapping screw IS-P5x20 14 1140 007 1003 1 Cover plate kit (B) ☐ 15 15 9074 477 2995 2 Pan head self-tapping screw IS-P4x12 (B) (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 12 SCS 01-2010 3.29
Parts Diagram
Page 20
...1 Inlet needle 1 Spring 1 Inlet control lever 1 Spindle 1 Round head screw 1 Gasket 1 Metering diaphragm 1 Gasket 1 Pump diaphragm 1 Air valve housing 4 Screw 1 Strainer 1 End cover 1 Screw 1 Throttle shaft with lever ☐ 16 1 Cap 1 Torsion spring 1 Throttle shutter 1 Oval head screw 1 Cap 1 High speed adjustment screw 1 Low speed adjustment screw 1 ... 2 Round head screw 1 Torsion spring 1 Choke shaft with lever 1 Throttle lever 1 Torsion spring 1 Throttle lever 1 Set of carburetor parts ☐ 6 - 9 (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 20 SCS 01-2010 3.29
...1 Inlet needle 1 Spring 1 Inlet control lever 1 Spindle 1 Round head screw 1 Gasket 1 Metering diaphragm 1 Gasket 1 Pump diaphragm 1 Air valve housing 4 Screw 1 Strainer 1 End cover 1 Screw 1 Throttle shaft with lever ☐ 16 1 Cap 1 Torsion spring 1 Throttle shutter 1 Oval head screw 1 Cap 1 High speed adjustment screw 1 Low speed adjustment screw 1 ... 2 Round head screw 1 Torsion spring 1 Choke shaft with lever 1 Throttle lever 1 Torsion spring 1 Throttle lever 1 Set of carburetor parts ☐ 6 - 9 (1) MS 311, (2) MS 311-Z, (3) MS 391, (4) MS 391-Z MS 311, MS 391 20 SCS 01-2010 3.29