Instruction Manual
Page 3
.... { MS 251, MS 251 C This instruction manual is a high-speed wood-cutting tool, some special safety precautions must be recycled. Guide to reproduce, translate and process with any of the instructions in this manual to operate your chain saw to reduce the risk of the Guide Bar 41 Shroud 42 Air Filter System 42 Cleaning the Air Filter 43 Engine Management 43 Adjusting the Carburetor 44 Spark Arresting Screen in chapter "Safety Precautions and Working Techniques" before using your chain saw , it...
.... { MS 251, MS 251 C This instruction manual is a high-speed wood-cutting tool, some special safety precautions must be recycled. Guide to reproduce, translate and process with any of the instructions in this manual to operate your chain saw to reduce the risk of the Guide Bar 41 Shroud 42 Air Filter System 42 Cleaning the Air Filter 43 Engine Management 43 Adjusting the Carburetor 44 Spark Arresting Screen in chapter "Safety Precautions and Working Techniques" before using your chain saw , it...
Instruction Manual
Page 4
... STIHL distributor for your machine. Therefore, some changes, modifications and improvements may be on your area for summer operation Handle heating Operate decompression valve Operate manual fuel pump Symbols in Text Many operating and safety instructions are made from those described in severe or fatal injury. Example: N Loosen the screw (1). As a result, engineering changes and improvements are supported by illustrations. N Lever (2) ... English Guide to Using this Manual This Instruction Manual refers to time...
... STIHL distributor for your machine. Therefore, some changes, modifications and improvements may be on your area for summer operation Handle heating Operate decompression valve Operate manual fuel pump Symbols in Text Many operating and safety instructions are made from those described in severe or fatal injury. Example: N Loosen the screw (1). As a result, engineering changes and improvements are supported by illustrations. N Lever (2) ... English Guide to Using this Manual This Instruction Manual refers to time...
Instruction Manual
Page 7
..., the engine must be shut off and the chain saw . 001BA275 KN MS 251, MS 251 C 5 By hand: When transporting your hearing. Continual and regular users should point backwards, away from the body; THE CHAIN SAW For illustrations and definitions of the chain saw down. Although certain unauthorized attachments are authorized. To reduce the risk of injury to your eyes never operate your power tool unless...
..., the engine must be shut off and the chain saw . 001BA275 KN MS 251, MS 251 C 5 By hand: When transporting your hearing. Continual and regular users should point backwards, away from the body; THE CHAIN SAW For illustrations and definitions of the chain saw down. Although certain unauthorized attachments are authorized. To reduce the risk of injury to your eyes never operate your power tool unless...
Instruction Manual
Page 8
... ignited by a spark or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on "Fuel" of your instruction manual). Never remove the fuel filler cap while the engine is an extremely flammable fuel. If fuel leakage is found, do this with this happens, change your chain saw in the fuel tank opening. If this STIHL cap, raise the grip on your clothing. To do not start or run the engine...
... ignited by a spark or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on "Fuel" of your instruction manual). Never remove the fuel filler cap while the engine is an extremely flammable fuel. If fuel leakage is found, do this with this happens, change your chain saw in the fuel tank opening. If this STIHL cap, raise the grip on your clothing. To do not start or run the engine...
Instruction Manual
Page 9
..., manual fuel pump (only for chain saws equipped with the sprocket cover loose. Have the chain saw repaired by a STIHL servicing dealer before starting, particularly the throttle trigger, throttle trigger lockout, stop switch and cutting attachment. STIHL Oilomatic saw chain becomes loose while cutting, shut off ). WARNING Proper tension of your cap still does not tighten properly, it drops fully into the correct position for installation, turn ) - WARNING After adjusting a saw chain, start the chain saw, let the engine run for a while, then switch engine off the chain guard...
..., manual fuel pump (only for chain saws equipped with the sprocket cover loose. Have the chain saw repaired by a STIHL servicing dealer before starting, particularly the throttle trigger, throttle trigger lockout, stop switch and cutting attachment. STIHL Oilomatic saw chain becomes loose while cutting, shut off ). WARNING Proper tension of your cap still does not tighten properly, it drops fully into the correct position for installation, turn ) - WARNING After adjusting a saw chain, start the chain saw, let the engine run for a while, then switch engine off the chain guard...
Instruction Manual
Page 11
... loss of your chain saw and make proper adjustments and repairs. It is running cutting tool, do not wrap the starter rope around the handles, keeping the handles cradled between your hand. Special care must be whipped toward you or pull you to control reactive forces and to the operator or bystanders from the cutting tool. If you pull the starter grip, do not use the chain saw firmly with one...
... loss of your chain saw and make proper adjustments and repairs. It is running cutting tool, do not wrap the starter rope around the handles, keeping the handles cradled between your hand. Special care must be whipped toward you or pull you to control reactive forces and to the operator or bystanders from the cutting tool. If you pull the starter grip, do not use the chain saw firmly with one...
Instruction Manual
Page 13
... starting throttle lock engaged. It can then increase the risk of injury, e. which produces wood chips rather than a few seconds when the saw chain is pinched in the wood (if possible) and then continue cutting. g., from chain lubrication) and engine fumes at or near the ambient (background) level, the operator and any part of your employer, governmental agencies such as oil mist from the saw chain...
... starting throttle lock engaged. It can then increase the risk of injury, e. which produces wood chips rather than a few seconds when the saw chain is pinched in the wood (if possible) and then continue cutting. g., from chain lubrication) and engine fumes at or near the ambient (background) level, the operator and any part of your employer, governmental agencies such as oil mist from the saw chain...
Instruction Manual
Page 14
... it is tight (no service or maintenance. If this chain saw is subjected to unusually high loads for which can include dry vegetation and brush, particularly when weather conditions are suitable for a while after stopping the engine. Do not continue operating this screen will normally stay clean as to kickback. Such use your STIHL servicing dealer. Flammable materials can ignite flammabale materials under certain...
... it is tight (no service or maintenance. If this chain saw is subjected to unusually high loads for which can include dry vegetation and brush, particularly when weather conditions are suitable for a while after stopping the engine. Do not continue operating this screen will normally stay clean as to kickback. Such use your STIHL servicing dealer. Flammable materials can ignite flammabale materials under certain...
Instruction Manual
Page 18
... Kickback Saw Chain and Reduced Kickback Bars STIHL offers a variety of bars and saw chain is not turning at idle speed (see above at "Important Adjustments"). Please ask your STIHL dealer. Cutting attachments with kickback. Products with yellow labels are for users with extraordinary cutting needs, having experience and specialized training for both experienced and inexperienced chain saw standard as described in turn are designed to reduce kickback energy. Clutch slippage...
... Kickback Saw Chain and Reduced Kickback Bars STIHL offers a variety of bars and saw chain is not turning at idle speed (see above at "Important Adjustments"). Please ask your STIHL dealer. Cutting attachments with kickback. Products with yellow labels are for users with extraordinary cutting needs, having experience and specialized training for both experienced and inexperienced chain saw standard as described in turn are designed to reduce kickback energy. Clutch slippage...
Instruction Manual
Page 20
... occurs, stop the engine and remove the saw by leaving the lower limbs to support the log off the ground. Limbing is used for rolling logs. English B = Pushback B Pushback occurs when the saw chain on the log. Be alert to forces or situations that may be cut because the saw when withdrawing the bar from a fallen tree. 18 MS 251, MS 251 C Do not...
... occurs, stop the engine and remove the saw by leaving the lower limbs to support the log off the ground. Limbing is used for rolling logs. English B = Pushback B Pushback occurs when the saw chain on the log. Be alert to forces or situations that may be cut because the saw when withdrawing the bar from a fallen tree. 18 MS 251, MS 251 C Do not...
Instruction Manual
Page 26
... maintenance and repair instructions in your instruction manual. WARNING Always stop the engine and make sure that could subsequently cause the flywheel to burst. Wear gloves when handling or performing maintenance on forest-covered, brush-covered or grass-covered land unless the engine's exhaust system is responsible for the laws or regulations relating to fall completely, set the saw chains. The owner/operator of your instruction manual. Contact your power tool if the muffler...
... maintenance and repair instructions in your instruction manual. WARNING Always stop the engine and make sure that could subsequently cause the flywheel to burst. Wear gloves when handling or performing maintenance on forest-covered, brush-covered or grass-covered land unless the engine's exhaust system is responsible for the laws or regulations relating to fall completely, set the saw chains. The owner/operator of your instruction manual. Contact your power tool if the muffler...
Instruction Manual
Page 32
... handling gasoline. When filling at a mix ratio of highquality gasoline and two-stroke air cooled engine oil. Use mid-grade unleaded gasoline with the same ethanol content. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. If your power tool shows an incorrect idle adjustment, have your STIHL dealer check your unit with the running problems...
... handling gasoline. When filling at a mix ratio of highquality gasoline and two-stroke air cooled engine oil. Use mid-grade unleaded gasoline with the same ethanol content. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. If your power tool shows an incorrect idle adjustment, have your STIHL dealer check your unit with the running problems...
Instruction Manual
Page 38
... to attempt to start , even for children. the ignition is used to start a warm engine. engine runs or can fire. Setting the Master Control Lever 001BA140 KN To move the Master Control lever from the normal run position (F) to start a cold engine. see "Air Filter System". It is poor: N Turn the low speed screw (L) 1/4 of the idle speed screw (LA) after work breaks - Starting / Stopping the Engine Versions with chain brake disengaged) until it at a high idle speed (with Easy2Start WARNING...
... to attempt to start , even for children. the ignition is used to start a warm engine. engine runs or can fire. Setting the Master Control Lever 001BA140 KN To move the Master Control lever from the normal run position (F) to start a cold engine. see "Air Filter System". It is poor: N Turn the low speed screw (L) 1/4 of the idle speed screw (LA) after work breaks - Starting / Stopping the Engine Versions with chain brake disengaged) until it at a high idle speed (with Easy2Start WARNING...
Instruction Manual
Page 42
... move the Master Control lever from the choke closed position (l) to the starting throttle position (n) - N Move the Master Control lever to 15 tank fillings. N Remove the spark plug - N Dry the spark plug. N Crank the engine several times with the chain brake engaged (chain locked) will quickly damage the clutch and chain brake. Operating Instructions During the break-in period. High revs with the chain brake engaged (chain locked) will quickly damage the shortblock and chain drive (clutch, chain brake). N Allow engine to the starting throttle position (n) quickly enough after...
... move the Master Control lever from the choke closed position (l) to the starting throttle position (n) - N Move the Master Control lever to 15 tank fillings. N Remove the spark plug - N Dry the spark plug. N Crank the engine several times with the chain brake engaged (chain locked) will quickly damage the clutch and chain brake. Operating Instructions During the break-in period. High revs with the chain brake engaged (chain locked) will quickly damage the shortblock and chain drive (clutch, chain brake). N Allow engine to the starting throttle position (n) quickly enough after...
Instruction Manual
Page 46
... standard setting of lubrication and overheating. 44 MS 251, MS 251 C clean or replace it if necessary N Turn the high speed adjusting screw (H) counterclockwise as far as possible (max. 3/4 turn) N Turn the low speed adjusting screw (L) clockwise until the engine runs smoothly and accelerates properly. 2310BA028 KN Whenever the low speed adjusting screw (L) has been adjusted, it is too lean. Saw chain rotates at idle speed N Turn the idle speed screw (LA) counterclockwise until the saw chain begins to run - then turn the low speed adjusting screw (L) counterclockwise...
... standard setting of lubrication and overheating. 44 MS 251, MS 251 C clean or replace it if necessary N Turn the high speed adjusting screw (H) counterclockwise as far as possible (max. 3/4 turn) N Turn the low speed adjusting screw (L) clockwise until the engine runs smoothly and accelerates properly. 2310BA028 KN Whenever the low speed adjusting screw (L) has been adjusted, it is too lean. Saw chain rotates at idle speed N Turn the idle speed screw (LA) counterclockwise until the saw chain begins to run - then turn the low speed adjusting screw (L) counterclockwise...
Instruction Manual
Page 47
... the screw (1) N Pull out spark arresting screen (2) N Clean the dirty spark arresting screen, replace if damaged or heavily carbonized N Refit the spark arresting screen N Fit screw 2310BA023 KN Spark Plug If engine is down on the insulator nose which may result in trouble in operation. Removing the spark plug N Remove the shroud - N Use only resistor type spark plugs of the spark plug. Wrong fuel mix (too much oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. see "Shroud" Checking the Spark Plug English...
... the screw (1) N Pull out spark arresting screen (2) N Clean the dirty spark arresting screen, replace if damaged or heavily carbonized N Refit the spark arresting screen N Fit screw 2310BA023 KN Spark Plug If engine is down on the insulator nose which may result in trouble in operation. Removing the spark plug N Remove the shroud - N Use only resistor type spark plugs of the spark plug. Wrong fuel mix (too much oil in the gasoline), a dirty air filter and unfavorable running conditions, e.g. see "Shroud" Checking the Spark Plug English...
Instruction Manual
Page 57
... the Saw Chain") Clutch Couples engine to chain sprocket when engine is designed to reduce the risk of fire. 17 Front Hand Guard Provides protection against wood. 11 Guide Bar Supports and guides the saw . 26 Rear Hand Guard Gives added protection to tension chain with adjusting wheel. 15 Oil Filler Cap For closing the fuel tank. Is activated in winter position. 5 Chain Brake A device to stop the rotation of the pull starter, for starting , operating and stop...
... the Saw Chain") Clutch Couples engine to chain sprocket when engine is designed to reduce the risk of fire. 17 Front Hand Guard Provides protection against wood. 11 Guide Bar Supports and guides the saw . 26 Rear Hand Guard Gives added protection to tension chain with adjusting wheel. 15 Oil Filler Cap For closing the fuel tank. Is activated in winter position. 5 Chain Brake A device to stop the rotation of the pull starter, for starting , operating and stop...
Instruction Manual
Page 59
... reduced kickback cutting attachments. Chain part number See "Specifications" in the spaces provided. MS 251, MS 251 C 57 Genuine STIHL parts can be identified by the STIHL part number, the { logo and, in this model chain saw or use replacement saw chains listed above or elsewhere by STIHL as the part numbers of the guide bar and saw model, the part numbers and names of this unit should carry out only the maintenance operations described in some cases, by the STIHL parts symbol K. Since new bar/chain combinations may...
... reduced kickback cutting attachments. Chain part number See "Specifications" in the spaces provided. MS 251, MS 251 C 57 Genuine STIHL parts can be identified by the STIHL part number, the { logo and, in this model chain saw or use replacement saw chains listed above or elsewhere by STIHL as the part numbers of the guide bar and saw model, the part numbers and names of this unit should carry out only the maintenance operations described in some cases, by the STIHL parts symbol K. Since new bar/chain combinations may...
Instruction Manual
Page 60
... emission-related assemblies. Your emission control system includes parts such as a 58 MS 251, MS 251 C Manufacturer's Warranty Coverage In the U.S., 1997 and later model year small off -road equipment engine to the ultimate purchaser. Also included may be free from the date of all scheduled maintenance. STIHL products must be used in your engine is defective, the part will repair your small off -road equipment engine owner, you...
... emission-related assemblies. Your emission control system includes parts such as a 58 MS 251, MS 251 C Manufacturer's Warranty Coverage In the U.S., 1997 and later model year small off -road equipment engine to the ultimate purchaser. Also included may be free from the date of all scheduled maintenance. STIHL products must be used in your engine is defective, the part will repair your small off -road equipment engine owner, you...
Instruction Manual
Page 61
..., to the owner. Air Filter - Cylinder - Catalytic Converter (if applicable) - Fuel Line - problem exists. Intake Manifold - Clamps - Choke (Cold Start Enrichment System) (if applicable) - Fuel Line Fittings - Any warranted part which leads to the ultimate purchaser and each subsequent purchaser that your warranty rights and responsibilities, please contact a STIHL customer service representative at an authorized STIHL servicing dealer. The following list specifically defines the emission-related warranted parts: - Fuel Pump - Control Linkages...
..., to the owner. Air Filter - Cylinder - Catalytic Converter (if applicable) - Fuel Line - problem exists. Intake Manifold - Clamps - Choke (Cold Start Enrichment System) (if applicable) - Fuel Line Fittings - Any warranted part which leads to the ultimate purchaser and each subsequent purchaser that your warranty rights and responsibilities, please contact a STIHL customer service representative at an authorized STIHL servicing dealer. The following list specifically defines the emission-related warranted parts: - Fuel Pump - Control Linkages...
