Product Instruction Manual
Page 2
... 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 continually improve all...Cleaning Air Filter 40 Motor Management 41 Adjusting the Carburetor 41 Spark Arresting Screen in USA As a result, engineering changes and improvements are made from those described in this Manual, please contact your STIHL dealer for your area if you read and ...
... 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 continually improve all...Cleaning Air Filter 40 Motor Management 41 Adjusting the Carburetor 41 Spark Arresting Screen in USA As a result, engineering changes and improvements are made from those described in this Manual, please contact your STIHL dealer for your area if you read and ...
Product Instruction Manual
Page 26
... chain is used , STIHL may be properly maintained. Like an automobile brake, a chainsaw chain brake incurs wear each use. !Warning! Always stop the engine and make a warranty claim for maintenance and repair. Keep the chain, bar and sprocket clean; MS 290, MS 310, MS 390 25 However, if you... only identical STIHL replacement parts for a component which the saw chains. !Warning! The amount of wear will increase the risk of fire and hearing loss. Have such work or cleaning the power tool. !Warning! Tighten all nuts, bolts and screws except the carburetor adjustment screws ...
... chain is used , STIHL may be properly maintained. Like an automobile brake, a chainsaw chain brake incurs wear each use. !Warning! Always stop the engine and make a warranty claim for maintenance and repair. Keep the chain, bar and sprocket clean; MS 290, MS 310, MS 390 25 However, if you... only identical STIHL replacement parts for a component which the saw chains. !Warning! The amount of wear will increase the risk of fire and hearing loss. Have such work or cleaning the power tool. !Warning! Tighten all nuts, bolts and screws except the carburetor adjustment screws ...
Product Instruction Manual
Page 29
..., increases the risk of 89 (R+M/2). Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. 28 MS 290, MS 310, MS 390 Do not use BIA or TCW rated (twostroke water cooled) mix oils or other ..., chainsaws, mopeds, etc.). Do not fill fuel canisters that you use for use in order to operate on unleaded gasoline and the STIHL twostroke engine oil at the pump, first remove the canister from your area is specially formulated for use premium unleaded fuel. The machine's...
..., increases the risk of 89 (R+M/2). Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as necessary. 28 MS 290, MS 310, MS 390 Do not use BIA or TCW rated (twostroke water cooled) mix oils or other ..., chainsaws, mopeds, etc.). Do not fill fuel canisters that you use for use in order to operate on unleaded gasoline and the STIHL twostroke engine oil at the pump, first remove the canister from your area is specially formulated for use premium unleaded fuel. The machine's...
Product Instruction Manual
Page 34
It is subject 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... - 139BA001 KN Winter Operation English / USA Chain brake maintenance The chain brake is necessary to normal wear. slot vertical. : Lift off the carburetor box cover 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
It is subject 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... - 139BA001 KN Winter Operation English / USA Chain brake maintenance The chain brake is necessary to normal wear. slot vertical. : Lift off the carburetor box cover 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
... cold engine. 34 MS 290, MS 310, MS 390 This is used to start a warm engine. 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 ...the throttle trigger is squeezed. To move the Master Control lever from around the cylinder and mixed with the twist lock. this helps prevent carburetor icing. At temperatures above +20 °C (70°F) : Return shutter and prefilter to avoid engine running problems, i.e. ignition is ...
... cold engine. 34 MS 290, MS 310, MS 390 This is used to start a warm engine. 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 ...the throttle trigger is squeezed. To move the Master Control lever from around the cylinder and mixed with the twist lock. this helps prevent carburetor icing. At temperatures above +20 °C (70°F) : Return shutter and prefilter to avoid engine running problems, i.e. ignition is ...
Product Instruction Manual
Page 38
... (1) upward and out. 139BA001 KN MS 290, MS 310, MS 390 37 Always disengage chain brake before starting work. 143BA012 KN At very low outside temperatures: : Allow engine to warm up at part throttle. : Change over to 0. : Turn the twist lock above the rear handle counterclockwise - slot vertical. : lift off the carburetor box cover to 0.
... (1) upward and out. 139BA001 KN MS 290, MS 310, MS 390 37 Always disengage chain brake before starting work. 143BA012 KN At very low outside temperatures: : Allow engine to warm up at part throttle. : Change over to 0. : Turn the twist lock above the rear handle counterclockwise - slot vertical. : lift off the carburetor box cover to 0.
Product Instruction Manual
Page 39
... 5 to 15 tank fillings. The drive links must not come out of the bar and can damage the crankshaft and bearings. 38 MS 290, MS 310, MS 390 Retension if necessary - see "Adjusting Carburetor". The engine develops its maximum power after finishing work. this period. Running the engine at higher revs with the starter to...
... 5 to 15 tank fillings. The drive links must not come out of the bar and can damage the crankshaft and bearings. 38 MS 290, MS 310, MS 390 Retension if necessary - see "Adjusting Carburetor". The engine develops its maximum power after finishing work. this period. Running the engine at higher revs with the starter to...
Product Instruction Manual
Page 40
.... with a film of machine) to vary the oil feed rate as it again. This protects engine-mounted components (ignition, carburetor) from sources of ignition, until you replace the chain - 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 the...
.... with a film of machine) to vary the oil feed rate as it again. This protects engine-mounted components (ignition, carburetor) from sources of ignition, until you replace the chain - 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 the...
Product Instruction Manual
Page 41
... 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 the rear. : Clean away loose dirt from around filter. * see "Guide to suit different operating conditions by simply installing ... mm) 0.16" (4.0 mm) 0.24" (6.0 mm) 0.28" (7.0 mm) The air filter system can be adapted to Using this Manual" 40 MS 290, MS 310, MS 390 Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult. Fleece filter (non-woven)* For dry and very dusty work...
... 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 the rear. : Clean away loose dirt from around filter. * see "Guide to suit different operating conditions by simply installing ... mm) 0.16" (4.0 mm) 0.24" (6.0 mm) 0.28" (7.0 mm) The air filter system can be adapted to Using this Manual" 40 MS 290, MS 310, MS 390 Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult. Fleece filter (non-woven)* For dry and very dusty work...
Product Instruction Manual
Page 42
...an optimum fuel-air mixture under most operating conditions. MS 290, MS 310, MS 390 41 In case of the filter. General information The carburetor comes from the inside outward. With this carburetor it out with compressed air from the factory with STIHL universal cleaner or in a clean, non-flammable cleaning.... : Knock the filter out on the palm of the fundamental engine parameters and components (e.g. Motor Management English / USA Adjusting the Carburetor 1 3 22 Exhaust emissions are controlled by the design of your hand or blow it is only possible to clean the fleece filter...
...an optimum fuel-air mixture under most operating conditions. MS 290, MS 310, MS 390 41 In case of the filter. General information The carburetor comes from the inside outward. With this carburetor it out with compressed air from the factory with STIHL universal cleaner or in a clean, non-flammable cleaning.... : Knock the filter out on the palm of the fundamental engine parameters and components (e.g. Motor Management English / USA Adjusting the Carburetor 1 3 22 Exhaust emissions are controlled by the design of your hand or blow it is only possible to clean the fleece filter...
Product Instruction Manual
Page 47
Replacing a broken rewind spring : Remove the rope rotor. STIHL BioPlus, completely fill the chain oil tank. : Store the... fins and air filter. : If you take them and spray with local environmental requirements. : Run engine until carburetor is dry, this process. it in the counterclockwise direction, starting outside and working inward. : Reinstall the rope ...secure 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 If the spring pops out ...
Replacing a broken rewind spring : Remove the rope rotor. STIHL BioPlus, completely fill the chain oil tank. : Store the... fins and air filter. : If you take them and spray with local environmental requirements. : Run engine until carburetor is dry, this process. it in the counterclockwise direction, starting outside and working inward. : Reinstall the rope ...secure 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 If the spring pops out ...
Product Instruction Manual
Page 54
...operation 3) not 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 - If your daily working time is longer than normal or cutting conditions are difficult ... electrode gap Replace after each refueling 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 If you only use the saw occasionally, extend the intervals accordingly.
...operation 3) not 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 - If your daily working time is longer than normal or cutting conditions are difficult ... electrode gap Replace after each refueling 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 If you only use the saw occasionally, extend the intervals accordingly.
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
...(handlebar). Must be depressed before the throttle trigger can be activated. 22. Rear Hand Guard. The exposed end of chain tension. 8. Carburetor Box Cover Twist Lock. The toothed wheel that drives the saw chain. 11. Permits precise adjustment of the guide bar. (not illustrated,...by the engine and cutting attachment to chain sprocket when engine is accelerated beyond idle speed. (not illustrated). Lever for carburetor box cover. 2. MS 290, MS 310, MS 390 55 English / USA Definitions 1. Chain Tensioner. Reduces engine exhaust noise and directs the exhaust gases. 14. Master ...
...(handlebar). Must be depressed before the throttle trigger can be activated. 22. Rear Hand Guard. The exposed end of chain tension. 8. Carburetor Box Cover Twist Lock. The toothed wheel that drives the saw chain. 11. Permits precise adjustment of the guide bar. (not illustrated,...by the engine and cutting attachment to chain sprocket when engine is accelerated beyond idle speed. (not illustrated). Lever for carburetor box cover. 2. MS 290, MS 310, MS 390 55 English / USA Definitions 1. Chain Tensioner. Reduces engine exhaust noise and directs the exhaust gases. 14. Master ...
Product Instruction Manual
Page 57
...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 MS 310 Displacement Bore Stroke Idle speed 3.60 cu.in (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) Fuel / Oil System Diaphragm carburetor All position with integral ...
...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 MS 310 Displacement Bore Stroke Idle speed 3.60 cu.in (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) Fuel / Oil System Diaphragm carburetor All position with integral ...
Product Instruction Manual
Page 60
...back the warranty card to a STIHL service center as soon as the carburetor and the ignition system. Owner's Warranty Responsibilities: As the small off -road equipment engines are responsible for a period of charge. STIHL Incorporated recommends that your small off...at the time of all applicable regulations. 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 repaired or replaced by STIHL Incorporated STIHL Incorporated warrants to exceed 30 days. ...
...back the warranty card to a STIHL service center as soon as the carburetor and the ignition system. Owner's Warranty Responsibilities: As the small off -road equipment engines are responsible for a period of charge. STIHL Incorporated recommends that your small off...at the time of all applicable regulations. 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 repaired or replaced by STIHL Incorporated STIHL Incorporated warrants to exceed 30 days. ...
Product Instruction Manual
Page 61
Any such work will be performed either at STIHL Incorporated or at any independent test laboratory. Emission test may be performed at and after the first scheduled replacement point. 60 MS 290, MS 310, MS 390 Deviations from this manual are based on the application of ...and adjustments necessary for required maintenance at an authorized STIHL servicing dealer. Limitations 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...
Any such work will be performed either at STIHL Incorporated or at any independent test laboratory. Emission test may be performed at and after the first scheduled replacement point. 60 MS 290, MS 310, MS 390 Deviations from this manual are based on the application of ...and adjustments necessary for required maintenance at an authorized STIHL servicing dealer. Limitations 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...