Product Instruction Manual
Page 2
... 39 Air Filter System 40 Cleaning Air Filter 40 Motor Management 41 Adjusting the Carburetor 41 Spark Arresting Screen in this Manual, please contact your chainsaw. CP. STIHL's philosophy is a high-speed wood-cutting tool, some special safety precautions must ... 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. !Warning! Contents...
... 39 Air Filter System 40 Cleaning Air Filter 40 Motor Management 41 Adjusting the Carburetor 41 Spark Arresting Screen in this Manual, please contact your chainsaw. CP. STIHL's philosophy is a high-speed wood-cutting tool, some special safety precautions must ... 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. !Warning! Contents...
Product Instruction Manual
Page 26
... individual. Keep the chain sharp. Tighten all nuts, bolts and screws except the carburetor adjustment screws after each time it must be properly maintained. In order for the chain brake ... with a spark-arresting screen to remove the flywheel or if an improper tool is used , STIHL may deny coverage. !Warning! replace worn sprockets or chains. Use the specified spark plug and make...such work performed by any maintenance or repair work not described in hot or dry weather. MS 290, MS 310, MS 390 25 Like an automobile brake, a chainsaw chain brake incurs wear each use. !Warning! However...
... individual. Keep the chain sharp. Tighten all nuts, bolts and screws except the carburetor adjustment screws after each time it must be properly maintained. In order for the chain brake ... with a spark-arresting screen to remove the flywheel or if an improper tool is used , STIHL may deny coverage. !Warning! replace worn sprockets or chains. Use the specified spark plug and make...such work performed by any maintenance or repair work not described in hot or dry weather. MS 290, MS 310, MS 390 25 Like an automobile brake, a chainsaw chain brake incurs wear each use. !Warning! However...
Product Instruction Manual
Page 29
...elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. 28 MS 290, MS 310, MS 390 The canister should be retensioned more often than one that are for some time. Check chain tension frequently - Use only STIHL two-... (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.). Take care when handling gasoline. The chemical composition of 50:1. We recommend STIHL 50:1 two-stroke engine oil since it must fit snugly against the underside of 89 (R+M/2). Avoid direct contact with a lower ...
...elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. 28 MS 290, MS 310, MS 390 The canister should be retensioned more often than one that are for some time. Check chain tension frequently - Use only STIHL two-... (e.g., outboard motors, snowmobiles, chainsaws, mopeds, etc.). Take care when handling gasoline. The chemical composition of 50:1. We recommend STIHL 50:1 two-stroke engine oil since it must fit snugly against the underside of 89 (R+M/2). Avoid direct contact with a lower ...
Product Instruction Manual
Page 34
slot vertical. : Lift off the carburetor box cover to have it serviced 1 and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: 139BA016 KN Full-time professional users: Semi-professional users (in agriculture and construction): Hobby and occasional users: every 3 months ... / USA Chain brake maintenance The chain brake is necessary to the rear. : Pull prefilter (1) upward and out. : Pull off the spark plug boot (2). 139BA002 KN MS 290, MS 310, MS 390 33
slot vertical. : Lift off the carburetor box cover to have it serviced 1 and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals: 139BA016 KN Full-time professional users: Semi-professional users (in agriculture and construction): Hobby and occasional users: every 3 months ... / USA Chain brake maintenance The chain brake is necessary to the rear. : Pull prefilter (1) upward and out. : Pull off the spark plug boot (2). 139BA002 KN MS 290, MS 310, MS 390 33
Product Instruction Manual
Page 35
... 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 it with cold air - Heated air is used to start a warm engine. ignition is used to start a cold engine. 34 MS 290, MS 310, MS 390 this helps prevent...
... 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 it with cold air - Heated air is used to start a warm engine. ignition is used to start a cold engine. 34 MS 290, MS 310, MS 390 this helps prevent...
Product Instruction Manual
Page 38
.... 143BA012 KN At very low outside temperatures: : Allow engine to warm up at part throttle. : Change over to 0. slot vertical. : lift off the carburetor box cover to 0. : Turn the twist lock above the rear handle counterclockwise - If fuel tank has been run until dry and then refueled: : Press in...began to fire, the combustion chamber has flooded. : set the Master Control lever to the rear. : Pull the prefilter (1) upward and out. 139BA001 KN MS 290, MS 310, MS 390 37 English / USA : Pull the hand guard back toward the front handle: = The chain brake is ready for operation.
.... 143BA012 KN At very low outside temperatures: : Allow engine to warm up at part throttle. : Change over to 0. slot vertical. : lift off the carburetor box cover to 0. : Turn the twist lock above the rear handle counterclockwise - If fuel tank has been run until dry and then refueled: : Press in...began to fire, the combustion chamber has flooded. : set the Master Control lever to the rear. : Pull the prefilter (1) upward and out. 139BA001 KN MS 290, MS 310, MS 390 37 English / USA : Pull the hand guard back toward the front handle: = The chain brake is ready for operation.
Product Instruction Manual
Page 39
... otherwise jump off the chain after about 5 to sag. see "Tensioning the Saw Chain"! The engine develops its maximum power after finishing work. see "Adjusting Carburetor". Retension the chain - Always slacken off the bar. Do not make the mixture leaner to n Warm Start even if engine is cold. : Press in decompression... not slackened off load) for some time. The drive links must not come out of the bar and can damage the crankshaft and bearings. 38 MS 290, MS 310, MS 390 this period.
... otherwise jump off the chain after about 5 to sag. see "Tensioning the Saw Chain"! The engine develops its maximum power after finishing work. see "Adjusting Carburetor". Retension the chain - Always slacken off the bar. Do not make the mixture leaner to n Warm Start even if engine is cold. : Press in decompression... not slackened off load) for some time. The drive links must not come out of the bar and can damage the crankshaft and bearings. 38 MS 290, MS 310, MS 390 this period.
Product Instruction Manual
Page 40
... : Slacken off , it could damage the crankshaft and bearings. MS 290, MS 310, MS 390 * Special accessory * see "Guide to Using this helps avoid one-sided wear, especially at the nose and underside of ignition, until you replace the chain - This protects engine-mounted components (ignition, carburetor) from sources of the bar. : Regularly clean the...
... : Slacken off , it could damage the crankshaft and bearings. MS 290, MS 310, MS 390 * Special accessory * see "Guide to Using this helps avoid one-sided wear, especially at the nose and underside of ignition, until you replace the chain - This protects engine-mounted components (ignition, carburetor) from sources of the bar. : Regularly clean the...
Product Instruction Manual
Page 41
... Manual" 40 MS 290, MS 310, MS 390 Fabric filter* For normal operating conditions and winter operation. If groove depth is a noticeable loss of engine power: : Press down the throttle trigger interlock and set Master Control lever to "Cold Start" l. : Turn the twist lock above the rearhandle counterclockwise. : Lift off the carburetor box cover to...
... Manual" 40 MS 290, MS 310, MS 390 Fabric filter* For normal operating conditions and winter operation. If groove depth is a noticeable loss of engine power: : Press down the throttle trigger interlock and set Master Control lever to "Cold Start" l. : Turn the twist lock above the rearhandle counterclockwise. : Lift off the carburetor box cover to...
Product Instruction Manual
Page 42
...Knock the filter out on the palm of stubborn dirt: : Wash with a standard setting. General information The carburetor comes from the inside outward. MS 290, MS 310, MS 390 41 Never use a brush to adjust the engine idle speed within fine limits! This setting provides an optimum fuel...-air mixture under most operating conditions. With this carburetor it out with compressed air from the factory with STIHL universal cleaner or...
...Knock the filter out on the palm of stubborn dirt: : Wash with a standard setting. General information The carburetor comes from the inside outward. MS 290, MS 310, MS 390 41 Never use a brush to adjust the engine idle speed within fine limits! This setting provides an optimum fuel...-air mixture under most operating conditions. With this carburetor it out with compressed air from the factory with STIHL universal cleaner or...
Product Instruction Manual
Page 47
...take them and spray with retaining frame in position in position. If the spring pops out of rope off the rotor. : Fit the fan housing. STIHL BioPlus, completely fill the chain oil tank. : Store the unit in a dry and high or locked location, out of the reach of the housing.... The bits of spring in this helps prevent the carburetor diaphragms sticking together. : Remove the saw chain and guide bar, clean them out of children and other unauthorized persons. 46 MS 290, MS 310, MS 390 For periods of about 3 months or longer: : Drain and clean the fuel ...
...take them and spray with retaining frame in position in position. If the spring pops out of rope off the rotor. : Fit the fan housing. STIHL BioPlus, completely fill the chain oil tank. : Store the unit in a dry and high or locked location, out of the reach of the housing.... The bits of spring in this helps prevent the carburetor diaphragms sticking together. : Remove the saw chain and guide bar, clean them out of children and other unauthorized persons. 46 MS 290, MS 310, MS 390 For periods of about 3 months or longer: : Drain and clean the fuel ...
Product Instruction Manual
Page 54
...stop weekly 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 hours of ...not adjusting screws) 2) Retighten Spark arresting screen 3) in muffler Inspect Clean or replace Check X Chain catcher Replace Safety label Replace 1) STIHL recommends that the following maintenance intervals apply for normal operating conditions only. Carburetor Check idle adjustment -
...stop weekly 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 hours of ...not adjusting screws) 2) Retighten Spark arresting screen 3) in muffler Inspect Clean or replace Check X Chain catcher Replace Safety label Replace 1) STIHL recommends that the following maintenance intervals apply for normal operating conditions only. Carburetor Check idle adjustment -
Product Instruction Manual
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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
...by inertia. 7. For closing the fuel tank. 20. The support handle for carburetor box cover. 2. Rear Hand Guard. Clutch. Chain Sprocket. Front Handle (handlebar). MS 290, MS 310, MS 390 55 Carburetor Box Cover Twist Lock. Chain Brake. Front Hand Guard. Lever for holding saw... the exhaust gases. 14. Guide Bar. Releases compression pressure to the operator's hands. (not illustrated). Rear Handle. Carburetor Adjusting Screws. Toothed stop for choke control, starting throttle, run and stop the rotation of the starter, for the left...
...by inertia. 7. For closing the fuel tank. 20. The support handle for carburetor box cover. 2. Rear Hand Guard. Clutch. Chain Sprocket. Front Handle (handlebar). MS 290, MS 310, MS 390 55 Carburetor Box Cover Twist Lock. Chain Brake. Front Hand Guard. Lever for holding saw... the exhaust gases. 14. Guide Bar. Releases compression pressure to the operator's hands. (not illustrated). Rear Handle. Carburetor Adjusting Screws. Toothed stop for choke control, starting throttle, run and stop the rotation of the starter, for the left...
Product Instruction Manual
Page 57
... 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...) 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) Fuel / Oil System Diaphragm carburetor All position with ...
... 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...) 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) Fuel / Oil System Diaphragm carburetor All position with ...
Product Instruction Manual
Page 60
..., to abuse, neglect, improper maintenance or unapproved modifications. MS 290, MS 310, MS 390 59 Your emission control system includes parts such as a problem exists. Where a warrantable condition exists, STIHL Incorporated will be aware, however, that you can write to a STIHL service center as soon as the carburetor and the ignition system. As the small off -road...
..., to abuse, neglect, improper maintenance or unapproved modifications. MS 290, MS 310, MS 390 59 Your emission control system includes parts such as a problem exists. Where a warrantable condition exists, STIHL Incorporated will be aware, however, that you can write to a STIHL service center as soon as the carburetor and the ignition system. As the small off -road...
Product Instruction Manual
Page 61
...This Emission Control Systems Warranty shall not cover any 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...not be performed either at STIHL Incorporated or at and after the first scheduled replacement point. 60 MS 290, MS 310, MS 390 Emission test may require shorter maintenance intervals. Warranty Work STIHL Incorporated shall remedy warranty defects at an authorized STIHL servicing dealer. English /...
...This Emission Control Systems Warranty shall not cover any 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...not be performed either at STIHL Incorporated or at and after the first scheduled replacement point. 60 MS 290, MS 310, MS 390 Emission test may require shorter maintenance intervals. Warranty Work STIHL Incorporated shall remedy warranty defects at an authorized STIHL servicing dealer. English /...