Product Instruction Manual
Page 2
...Spark Plug 43 Replacing Starter Rope and Rewind Spring 44 Storing the Machine 46 Checking and Replacing Chain Sprocket 47 Maintaining and Sharpening Saw Chain 48 Maintenance Chart 52 Parts and Controls 54 Specifications 56 Special Accessories 58 Ordering Spare Parts 58 Maintenance and Repairs 58 STIHl MS 290, MS 310, MS 390 STIHL... Incorporated Federal Emission Control Warranty Statement 59 Trademarks 61 Allow only persons who understand this Manual to operate your STIHL dealer for your area if you ...
...Spark Plug 43 Replacing Starter Rope and Rewind Spring 44 Storing the Machine 46 Checking and Replacing Chain Sprocket 47 Maintaining and Sharpening Saw Chain 48 Maintenance Chart 52 Parts and Controls 54 Specifications 56 Special Accessories 58 Ordering Spare Parts 58 Maintenance and Repairs 58 STIHl MS 290, MS 310, MS 390 STIHL... Incorporated Federal Emission Control Warranty Statement 59 Trademarks 61 Allow only persons who understand this Manual to operate your STIHL dealer for your area if you ...
Product Instruction Manual
Page 8
... match each other in order for you may cause arcing that the spark plug boot is secure - For proper assembly of the instruction manual.) ... below. !Warning! Keep the handles clean and dry at regular intervals (whenever the saw . !Warning! MS 290, MS 310, MS 390 7 Never operate your power tool if it is damaged, improperly adjusted or maintained, or not completely ..." of injury. !Warning! English / USA Before Starting Take off the engine and then tighten. STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to avoid improper setting...
... match each other in order for you may cause arcing that the spark plug boot is secure - For proper assembly of the instruction manual.) ... below. !Warning! Keep the handles clean and dry at regular intervals (whenever the saw . !Warning! MS 290, MS 310, MS 390 7 Never operate your power tool if it is damaged, improperly adjusted or maintained, or not completely ..." of injury. !Warning! English / USA Before Starting Take off the engine and then tighten. STIHL Oilomatic chain, guide bar and sprocket must move freely and always spring back to avoid improper setting...
Product Instruction Manual
Page 13
...not continue work with a catalytic converter cools down less rapidly than conventional mufflers, always set your muffler maintained by a STIHL servicing dealer. 12 MS 290, MS 310, MS 390 To reduce risk of the engine (e.g. Let the engine cool down in loss of control of a felled tree)...fire and burn injuries, the following specific safety precautions must be replaced in the muffler. To reduce the risk of the cylinder, spark plug) become hot during normal operation may interfere with a catalytic converter, which is furnished with screens designed to reduce the exhaust emissions...
...not continue work with a catalytic converter cools down less rapidly than conventional mufflers, always set your muffler maintained by a STIHL servicing dealer. 12 MS 290, MS 310, MS 390 To reduce risk of the engine (e.g. Let the engine cool down in loss of control of a felled tree)...fire and burn injuries, the following specific safety precautions must be replaced in the muffler. To reduce the risk of the cylinder, spark plug) become hot during normal operation may interfere with a catalytic converter, which is furnished with screens designed to reduce the exhaust emissions...
Product Instruction Manual
Page 26
... except the carburetor adjustment screws after each time it is engaged. MS 290, MS 310, MS 390 25 Use of non-STIHL parts may deny coverage. !Warning! Do not attempt any maintenance or repair work not described in good condition. Use the specified spark plug and make sure that the risk of forest fires is stopped before...
... except the carburetor adjustment screws after each time it is engaged. MS 290, MS 310, MS 390 25 Use of non-STIHL parts may deny coverage. !Warning! Do not attempt any maintenance or repair work not described in good condition. Use the specified spark plug and make sure that the risk of forest fires is stopped before...
Product Instruction Manual
Page 34
slot vertical. : Lift off the spark plug boot (2). 139BA002 KN MS 290, MS 310, MS 390 33 It is subject to normal wear. 139BA001 KN Winter Operation English / USA Chain brake maintenance The chain brake is necessary to the rear. : ...Pull prefilter (1) upward and out. : Pull off the carburetor box cover to have it serviced 1 and maintained regularly by trained personnel, such as your STIHL...
slot vertical. : Lift off the spark plug boot (2). 139BA002 KN MS 290, MS 310, MS 390 33 It is subject to normal wear. 139BA001 KN Winter Operation English / USA Chain brake maintenance The chain brake is necessary to the rear. : ...Pull prefilter (1) upward and out. : Pull off the carburetor box cover to have it serviced 1 and maintained regularly by trained personnel, such as your STIHL...
Product Instruction Manual
Page 35
...to n or l, press down the throttle trigger interlock and squeeze throttle trigger at the same time. The four positions of the spark plug (see illustration). : Refit the spark plug boot. : Install the prefilter (1) so that the symbol r (winter operation) points up. : Refit carburetor box cover and secure...180° and refit it with cold air - This is squeezed. The Master Control lever moves to start a cold engine. 34 MS 290, MS 310, MS 390 this helps prevent carburetor icing. Heated air is used to position s (summer operation). this position is switched off - To move...
...to n or l, press down the throttle trigger interlock and squeeze throttle trigger at the same time. The four positions of the spark plug (see illustration). : Refit the spark plug boot. : Install the prefilter (1) so that the symbol r (winter operation) points up. : Refit carburetor box cover and secure...180° and refit it with cold air - This is squeezed. The Master Control lever moves to start a cold engine. 34 MS 290, MS 310, MS 390 this helps prevent carburetor icing. Heated air is used to position s (summer operation). this position is switched off - To move...
Product Instruction Manual
Page 39
... chain tension frequently A new chain has to clear the combustion chamber. : Refit the spark plug and connect the spark plug boot (press it down . Retension the chain - English / USA Operating Instructions 2 : Pull off the spark plug boot (2). : Unscrew and dry off the spark plug. : Crank the engine several times with the chain brake engaged (saw chain at a standstill... (full throttle off , it cools down firmly) - The drive links must not come out of the bar and can damage the crankshaft and bearings. 38 MS 290, MS 310, MS 390
... chain tension frequently A new chain has to clear the combustion chamber. : Refit the spark plug and connect the spark plug boot (press it down . Retension the chain - English / USA Operating Instructions 2 : Pull off the spark plug boot (2). : Unscrew and dry off the spark plug. : Crank the engine several times with the chain brake engaged (saw chain at a standstill... (full throttle off , it cools down firmly) - The drive links must not come out of the bar and can damage the crankshaft and bearings. 38 MS 290, MS 310, MS 390
Product Instruction Manual
Page 44
... standard setting. : Warm up , fit a new one. : Refit the spark arresting screen - risk of engine damage. 1 1 1 3 2 139BA020 KN English / USA Checking the Spark Plug 000BA002 KN 139 BA021 KN If the engine is low on the insulator nose ...Spark Arresting Screen in Muffler* Adjustment for operation at high altitude A slight correction of the setting may result in trouble in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to Using this Manual" MS 290, MS 310, MS...
... standard setting. : Warm up , fit a new one. : Refit the spark arresting screen - risk of engine damage. 1 1 1 3 2 139BA020 KN English / USA Checking the Spark Plug 000BA002 KN 139 BA021 KN If the engine is low on the insulator nose ...Spark Arresting Screen in Muffler* Adjustment for operation at high altitude A slight correction of the setting may result in trouble in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to Using this Manual" MS 290, MS 310, MS...
Product Instruction Manual
Page 45
... To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. operating at idling speed, first check the spark plug. : Remove spark plug - Rectify problems which have caused fouling of the approved range. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are...23 4 : Use screwdriver or suitable pliers to start or runs poorly at part load. see "Specifications". : Use only resistor type spark plugs of spark plug: : Too much oil in the boot may pop out and uncoil during this operation. 133BA015 KN 44 MS 290, MS 310, MS 390
... To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. operating at idling speed, first check the spark plug. : Remove spark plug - Rectify problems which have caused fouling of the approved range. Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are...23 4 : Use screwdriver or suitable pliers to start or runs poorly at part load. see "Specifications". : Use only resistor type spark plugs of spark plug: : Too much oil in the boot may pop out and uncoil during this operation. 133BA015 KN 44 MS 290, MS 310, MS 390
Product Instruction Manual
Page 54
.... Carburetor Check idle adjustment - chain must not rotate X X Readjust idle Spark plug Readjust electrode gap Replace after about 100 operating hours All accessible screws and nuts (not adjusting screws) 2) Retighten Spark arresting screen 3) in all versions, market-specific before starting work after finishing...monthly every 12 months if problem if damaged as required English / USA X X X X X X X MS 290, MS 310, MS 390 53 Please note that this work be done by a STIHL servicing dealer 2) Firmly tighten cylinder base screws of professional saws (3.4 kW or more) after 10 to 20...
.... Carburetor Check idle adjustment - chain must not rotate X X Readjust idle Spark plug Readjust electrode gap Replace after about 100 operating hours All accessible screws and nuts (not adjusting screws) 2) Retighten Spark arresting screen 3) in all versions, market-specific before starting work after finishing...monthly every 12 months if problem if damaged as required English / USA X X X X X X X MS 290, MS 310, MS 390 53 Please note that this work be done by a STIHL servicing dealer 2) Firmly tighten cylinder base screws of professional saws (3.4 kW or more) after 10 to 20...
Product Instruction Manual
Page 55
English / USA Parts and Controls 54 1 Carburetor box cover twist lock 2 Carburetor adjusting screws 3 Spark plug boot 4 Chain sprocket cover 5 Chain sprocket 6 Chain brake 7 Chain tensioner 8 Chain catcher 9 Bumper spike 10 Guide bar 11 Oilomatic saw chain # Serial number 12 Oil filler cap 13 Muffler 14 Front hand guard 15 Front handle (handlebar) 16 Decompression valve* 17 Starter grip 18 Master Control lever 19 Fuel filler cap 20 Throttle trigger 21 Throttle trigger interlock 22 Rear handle 23 Rear hand guard * see "Guide to Using this Manual" MS 290, MS 310, MS 390
English / USA Parts and Controls 54 1 Carburetor box cover twist lock 2 Carburetor adjusting screws 3 Spark plug boot 4 Chain sprocket cover 5 Chain sprocket 6 Chain brake 7 Chain tensioner 8 Chain catcher 9 Bumper spike 10 Guide bar 11 Oilomatic saw chain # Serial number 12 Oil filler cap 13 Muffler 14 Front hand guard 15 Front handle (handlebar) 16 Decompression valve* 17 Starter grip 18 Master Control lever 19 Fuel filler cap 20 Throttle trigger 21 Throttle trigger interlock 22 Rear handle 23 Rear hand guard * see "Guide to Using this Manual" MS 290, MS 310, MS 390
Product Instruction Manual
Page 56
...English / USA Definitions 1. Spark Plug Boot. Guide Bar. Oil Filler Cap. Muffler. The grip of vibrations created by inertia. 7. Master Control Lever. Throttle Trigger. Controls the speed of chain tension. 8. Rear Handle. Guide Bar Nose. Clutch. MS 290, MS 310, MS 390 55 Carburetor Adjusting Screws...saw . 16. Carburetor Box Cover Twist Lock. Lock for starting the engine. 18. For fine tuning the carburetor. 3. Connects the spark plug with the ignition wire. 4. Covers the clutch and the sprocket. 5. Chain Sprocket. A device to the operator's hands. (not ...
...English / USA Definitions 1. Spark Plug Boot. Guide Bar. Oil Filler Cap. Muffler. The grip of vibrations created by inertia. 7. Master Control Lever. Throttle Trigger. Controls the speed of chain tension. 8. Rear Handle. Guide Bar Nose. Clutch. MS 290, MS 310, MS 390 55 Carburetor Adjusting Screws...saw . 16. Carburetor Box Cover Twist Lock. Lock for starting the engine. 18. For fine tuning the carburetor. 3. Connects the spark plug with the ignition wire. 4. Covers the clutch and the sprocket. 5. Chain Sprocket. A device to the operator's hands. (not ...
Product Instruction Manual
Page 57
... Emission Compliance Period referred to on the CARB Air Index Label indicates the terms: Extended = 300 hours Intermediate = 125 hours Moderate = 50 hours STIHL single cylinder two-stroke engine MS 290 Displacement Bore Stroke Idle speed 3.45 cu.in (56,5 cm3) 1.81 in (46 mm) 1.34 in (34 mm) 2,800 rpm...(59,0 cm3) 1.85 in (47 mm) 1.34 in (34 mm) 2,800 rpm MS 390 Displacement Bore Stroke Idle speed 3.90 cu.in (64,1 cm3) 1.93 in (49 mm) 1.34 in (34 mm) 2,800 rpm Magneto Ignition System Electronic (breakerless) Spark plug (suppressed) Bosch WSR 6 F, NGK BPMR 7 A, Electrode gap 0.02 in (0.5 mm...
... Emission Compliance Period referred to on the CARB Air Index Label indicates the terms: Extended = 300 hours Intermediate = 125 hours Moderate = 50 hours STIHL single cylinder two-stroke engine MS 290 Displacement Bore Stroke Idle speed 3.45 cu.in (56,5 cm3) 1.81 in (46 mm) 1.34 in (34 mm) 2,800 rpm...(59,0 cm3) 1.85 in (47 mm) 1.34 in (34 mm) 2,800 rpm MS 390 Displacement Bore Stroke Idle speed 3.90 cu.in (64,1 cm3) 1.93 in (49 mm) 1.34 in (34 mm) 2,800 rpm Magneto Ignition System Electronic (breakerless) Spark plug (suppressed) Bosch WSR 6 F, NGK BPMR 7 A, Electrode gap 0.02 in (0.5 mm...
Product Instruction Manual
Page 61
...of the following list specifically defines the emission-related warranted parts: Carburetor Choke (Cold start enrichment system) Intake manifold Air filter Spark plug Magneto or electronic ignition system (ignition module) Catalytic converter (if applicable) Fasteners Where to make a claim for Warranty Service ...or which is scheduled only for that a warranted part is defective. Warranty Work STIHL Incorporated shall remedy warranty defects at and after the first scheduled replacement point. 60 MS 290, MS 310, MS 390 English / USA If any emission related part on your engine is defective, ...
...of the following list specifically defines the emission-related warranted parts: Carburetor Choke (Cold start enrichment system) Intake manifold Air filter Spark plug Magneto or electronic ignition system (ignition module) Catalytic converter (if applicable) Fasteners Where to make a claim for Warranty Service ...or which is scheduled only for that a warranted part is defective. Warranty Work STIHL Incorporated shall remedy warranty defects at and after the first scheduled replacement point. 60 MS 290, MS 310, MS 390 English / USA If any emission related part on your engine is defective, ...