Stihl MS 650, MS 660 Instruction Manual

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STIHL MS 650, 660

Instruction Manual

Contents

English

Guide to Using this Manual 2 Safety Precautions 3 Reactive Forces 8 Working Techniques 9 Cutting Attachment 18 Mounting the Bar and Chain 19 Tensioning the Chain 20 Checking Chain Tension 20

Original Instruction ManualPrinted on chlorine-free paper

Fuel 20 Fueling 21 Chain Lubricant 22 Filling Chain Oil Tank 22 Checking Chain Lubrication 23 Chain Brake 23 Winter Operation 24 Electric Handle Heating 25 Starting / Stopping the Engine 25 Operating Instructions 29 Oil Quantity Control 30 Taking Care of the Guide Bar 30 Air Filter System 31 Remove Air Filter 32

Printing inks contain vegetable oils, paper can be recycled.

Cleaning the Air Filter 32 Adjusting the Carburetor 32 Spark Arresting Screen in Muffler 34 Spark Plug 34 Storing the Machine 35 Checking and Replacing the Chain

Sprocket 36 Maintaining and Sharpening the

Saw Chain 37 Maintenance and Care 41

Minimize Wear and Avoid Damage 43 Main Parts 44 Specifications 45 Ordering Spare Parts 46 Maintenance and Repairs 47 Disposal 47 EC Declaration of Conformity 47

Dear Customer,

Thank you for choosing a quality engineered STIHL product.

It has been built using modern production techniques and comprehensive quality assurance. Every effort has been made to ensure your satisfaction and trouble-free use of the product.

Please contact your dealer or our sales company if you have any queries concerning this product.

Your

Dr. Nikolas Stihl

0458-178-0121-B. VA9.D19.

0000000525_015_GB

MS 650, MS 660

English

Guide to Using this Manual

This Instruction Manual refers to a STIHL chain saw, also called a machine in this Instruction Manual.

Pictograms

Pictograms that appear on the machine are explained in this Instruction Manual.

Depending on the machine and equipment version, the following pictograms may appear on the machine.

Fuel tank; fuel mixture of gasoline and engine oil

Tank for chain oil; chain oil

Engage and release chain brake

Coasting brake

Intake air baffle: winter operation

Intake air baffle: summer operation

Handle heating

Actuate decompression valve

Actuate manual fuel pump

Symbols in text

WARNING

Warning where there is a risk of an accident or personal injury or serious damage to property.

Engineering improvements

STIHL's philosophy is to continually improve all of its products. For this reason we may modify the design, engineering and appearance of our products periodically.

Therefore, some changes, modifications and improvements may not be covered in this manual.

Direction of chain travel

Ematic; chain oil flow adjustment

Tension saw chain

NOTICE

Caution where there is a risk of damaging the machine or its individual components.

MS 650, MS 660

English

Safety Precautions

Special safety precautions must be observed to reduce the risk of personal injury when working with a chain saw because of the very high chain speed and very sharp cutters.

It is important that you read the instruction manual before first use and keep it in a safe place for future reference. Nonobservance of the instruction manual may result in serious or even fatal injury.

General

Observe all applicable local safety regulations, standards and ordinances.

The use of noise emitting power tools may be restricted to certain times by national or local regulations.

If you have not used this model before: Have your dealer or other experienced user show you how to operate your machine or attend a special course in its operation.

Minors should never be allowed to use a chain saw.

Keep bystanders, especially children, and animals away from the work area.

The user is responsible for avoiding injury to third parties or damage to their property.

Do not lend or rent your chain saw without the instruction manual. Be sure that anyone using it understands the information contained in this manual.

To operate a chain saw you must be rested, in good physical condition and mental health. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating a chain saw.

Do not operate the chain saw if you are under the influence of any substance (drugs, alcohol) which might impair vision, dexterity or judgment.

To reduce the risk of accidents or injury, put off the work in poor weather conditions (rain, snow, ice, wind).

Persons with pacemakers only: The ignition system of your chain saw produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce health risks, STIHL recommends that persons with pacemakers consult their physician and the pacemaker manufacturer before operating this power tool.

Intended use

The machine may only be used to saw wood and wooden objects.

Do not use the machine for any other purpose – risk of accidents!

Do not modify the machine in any way – this may increase the risk of personal injury. STIHL excludes all liability for personal injury and damage to property caused while using unauthorised attachments.

Clothing and Equipment

Wear proper protective clothing and equipment.

Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Wear snug fitting clothing with cutretardant pads – no loose-fitting jacket.

Avoid clothing that could get caught on branches, brush or moving parts of the machine. Do not wear a scarf, necktie or jewellery. Tie up and confine long hair (headscarf, cap, hard hat, etc.).

Wear suitable safety shoes – with cut-retardant material, non-slip soles and steel toe caps.

WARNING

To reduce the risk of eye injuries, wear tight-fitting safety goggles conforming to standard EN 166 or a face shield. Make sure that the safety goggles and the face shield fit correctly.

Wear "personal" hearing protection – for example, ear defenders.

Wear a hard hat wherever there is any risk of falling objects.

MS 650, MS 660

English

001BA115 KN

Wear sturdy protective gloves made of a resistant material (e.g. leather).

STIHL can supply a comprehensive range of personal protective equipment.

Transport

Before any transport – even over short distances – switch off the machine, engage the chain brake and attach the chain scabbard. This avoids the risk of the saw chain starting unintentionally.

Always carry the chain saw by the handle – with the hot muffler away from your body, the guide bar must point to the rear. Avoid touching hot parts of the machine, especially the surface of the muffler – risk of burns!

In vehicles: Properly secure the machine to prevent tipping, damage and chain oil or fuel spillage.

Cleaning

Clean plastic parts with a cloth. Harsh detergents can damage the plastic.

Clean the dust and dirt off the machine – do not use any grease solvents for this purpose.

Clean the ventilation slots if necessary.

Do not use a high-pressure cleaner to clean the machine. The hard jet of water can damage parts of the machine.

Accessories

Only use those tools, guide bars, chains, chain sprockets, accessories or technically equivalent components that have been approved by STIHL for this machine. If you have any questions in this respect, consult a servicing dealer. Use only high quality tools and accessories. Otherwise, there may be a risk of accidents and damage to the machine.

STIHL recommends the use of genuine STIHL tools, guide bars, chains, chain sprockets and accessories. They are specifically designed to match your model and meet your performance requirements.

Refuelling

Gasoline is an extremely flammable fuel – keep clear of naked flames and fire – do not spill any fuel – no smoking.

Switch off the engine before refuelling.

Never refuel the machine while the engine is still hot – the fuel may spill over – risk of fire!

Open the fuel filler cap carefully so that any excess pressure is relieved gradually and fuel does not splash out.

The machine may only be refuelled in a well ventilated place. Clean the machine immediately if fuel is spilled. Do not spill fuel over your clothing – contaminated clothing must be changed immediately.

The machines can be equipped with the following filler caps as standard:

Cliplock filler cap (bayonet-type)

Place the cliplock filler cap (bayonet-type) in position, turn as far as stop and fold the cliplock down.

This helps reduce the risk of unit vibrations causing an incorrectly tightened filler cap to loosen or come off and spill quantities of fuel.

Look out for leaks! Never start the engine if fuel has been spilled or is leaking – Fatal burns may result!

Before Starting Work

Check that your saw is properly assembled and in good condition – refer to appropriate chapters in the instruction manual.

– Check the fuel system for leaks,

paying special attention to visible parts such as the tank cap, hose connections and the manual fuel pump (on machines so equipped). If

MS 650, MS 660

English

001BA087 LÄ

there are any leaks or damage, do not start the engine – risk of fire. Have your saw repaired by a servicing dealer before using it again.

– Check operation of chain brake,

front hand guard

– Correctly mounted guide bar

– Correctly tensioned chain

– The trigger and trigger lockout must

move freely and spring back to the idle position when they are released.

– Master Control lever must move

easily to STOP, 0 or †

– Check that the spark plug boot is

secure – a loose boot may cause arcing that could ignite combustible fumes and cause a fire.

– Never attempt to modify the controls

or safety devices in any way.

– Keep the handles dry and clean –

free from oil and dirt – for safe control of the saw.

– Make sure there is sufficient fuel

and chain oil in the tanks.

To reduce the risk of personal injury, do not operate your saw if it is damaged or not properly assembled.

Starting the chain saw

Always work on a level surface. Ensure a firm and secure footing. Hold the machine securely – the chain must not touch any objects or the floor – danger of injury due to the rotating saw chain.

Your chain saw is a one-person saw. Do not allow other persons to be in the working area – not even while starting.

Do not start the chain saw if the chain is in a cut.

Move at least 3 meters away from the place where the machine was refuelled and never start the motor in enclosed spaces.

Lock the chain with the chain brake before starting – risk of injury due to rotating chain!

Do not drop-start the engine – start as described in the Instruction Manual.

During operation

Ensure you always have a firm and safe footing. Take special care when the bark is wet – danger of slipping!

Always hold the chain saw firmly with both hands: Right hand on the rear handle – even if you are left-handed. To ensure reliable control, wrap your thumbs tightly around the handlebar and handle.

In the event of impending danger or in an emergency, switch off the engine immediately by moving the Master Control lever / stop switch to STOP, 0 or †.

Never let the machine run unattended.

Exercise caution with slippery surfaces, water, snow, ice, steep slopes, uneven ground or green wood that has just been stripped of its bark – danger of slipping!

Use caution with tree stumps, roots, ditches – danger of stumbling!

Do not work alone – keep within calling distance of others who are trained in emergency procedures and can provide help in an emergency. Helpers at the cutting site must also wear protective clothing (helmet!) and stand well clear of the branches being cut.

More care and attention than usual are required when wearing ear protection, as warning sounds (shouts, beeps, etc.) cannot be heard properly.

Take a break in good time to avoid tiredness or exhaustion – risk of accidents!

Dust (e. g., sawdust), fumes and smoke produced while using the machine may be hazardous to health. If dust is generated, wear a dust mask.

When the engine is running: Note that the saw chain continues to rotate for a short period after you let go of the throttle trigger – coasting effect.

No smoking when working with or near the chain saw - risk of fire! Combustible fuel vapour may escape from the fuel system.

MS 650, MS 660

English

Examine the saw chain periodically at short intervals and as soon as you note any tangible changes:

– Switch off the engine; wait until the

saw chain is stationary

– Check condition and secure fitting

– Check sharpness

Never touch the saw chain when the engine is running. If the saw chain becomes jammed by an object, switch off the engine immediately before attempting to remove the object – risk of injury!

Always turn off the engine before leaving the machine unattended.

To change the saw chain, switch off the engine. Risk of injury from the motor starting unintentionally!

Keep easily combustible materials (e. g., wood chips, bark, dry grass, fuel) away from hot exhaust gases and hot mufflers – risk of fire! Mufflers with catalytic converters can become especially hot.

Never work without chain lubrication – monitor the oil level in the oil tank. Stop work immediately if the oil level in the oil tank is too low and top up with chain oil – see also "Topping up with chain oil" and "Check chain lubrication".

If the machine is subjected to unusually high loads for which it was not designed (e. g., heavy impact or a fall), always check that it is in good condition before continuing work – see also "Before starting work".

Check the fuel system for leaks and make sure the safety devices are working properly. Never continue using

a machine that is not in perfect working order. In case of doubt, have the unit checked by your servicing dealer.

Check for correct idling, so that the saw chain stops moving when the throttle trigger is released. Check the idle setting regularly and correct when possible. Have the machine repaired by a STIHL servicing dealer if the saw chain still continues to move during idling.

The chain saw produces poisonous exhaust gases as soon as the engine starts. These gases may be colourless and odourless and may contain unburnt hydrocarbons and benzene. Never work with the machine indoors or in poorly ventilated areas, even if your machine is equipped with a catalytic converter.

Ensure proper ventilation when working in trenches, hollows or other confined locations – risk of fatal injury from breathing toxic fumes!

If you feel sick, have a headache, vision problems (e. g., your field of vision gets smaller), hearing problems, dizziness or inability to concentrate, stop work immediately. Such symptoms may be caused by an excessively high concentration of exhaust emissions – risk of accident!

After finishing work

Switch off the motor, engage the chain brake and attach the chain scabbard.

Storage

When the machine is not in use, it should be stored in such a way that noone is endangered. Secure the machine against unauthorised use.

Store the machine in a safe, dry room.

Vibrations

Prolonged use of the power tool may result in vibration-induced circulation problems in the hands (whitefinger disease).

No general recommendation can be given for the length of usage because it depends on several factors.

The period of usage is prolonged by:

– Hand protection (wearing warm

gloves)

– Work breaks

The period of usage is shortened by:

– Any personal tendency to suffer

from poor circulation (symptoms: frequently cold fingers, tingling sensations).

– Low outside temperatures.

– The force with which the handles

are held (a tight grip restricts circulation).

Continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms appear (e.g. tingling sensation in fingers), seek medical advice.

MS 650, MS 660

English

Maintenance and repairs

Always switch off the engine before any repair, cleaning or maintenance work and any work on the chain. Risk of injury if the engine starts inadvertently!

Exception: adjustment of carburettor and idle speed.

The machine must be serviced regularly. Do not attempt any maintenance or repair work not described in the Instruction Manual. All other work should be carried out by a servicing dealer.

STIHL recommends that maintenance and repair work be carried out only by authorised STIHL dealers. STIHL dealers receive regular training and are supplied with technical information.

Use only high-quality spare parts. Otherwise, there may be a risk of accidents and damage to the machine. If you have any questions in this respect, consult a servicing dealer.

Do not modify the machine in any way – this may increase the risk of personal injury –risk of accidents!

To reduce the risk of fire due to ignition outside the cylinder, move the master control level to STOP, 0 or † before turning the engine over on the starter when the spark plug boot is removed or the spark plug is unscrewed!

Do not service or store the machine near a naked flame – risk of fire due to the fuel.

Check fuel cap regularly for tightness.

Use only spark plugs that are in perfect condition and have been approved by STIHL – see "Specifications".

Check ignition lead (insulation in good condition, secure connection).

Check that the muffler is in perfect working condition.

Do not use the machine if the muffler is damaged or missing – risk of fire, damage to hearing!

Never touch a hot muffler – risk of burns!

The condition of the anti-vibration elements influences vibration behaviour – inspect anti-vibration elements periodically.

Inspect chain catcher – replace if damaged.

Switch off the engine

– To check the chain tension

– To retension the chain

– To replace the chain

– For remedying malfunctions

Observe sharpening instructions – for safe and proper handling, always keep the chain and guide bar in flawless condition. Keep the chain properly sharpened, tensioned and well lubricated.

Change chain, guide bar and chain sprocket in due time.

Regularly check that the clutch drum is in perfect working condition.

Always store fuel and chain lubricant only in the specified type of containers and ensure they are correctly labelled. Store in a dry, cool and secure place protected against light and sunlight.

In the event of a chain brake malfunction, switch off the machine immediately – risk of injury! Consult a

servicing dealer – do not use the machine until the malfunction has been remedied, see "Chain brake".

MS 650, MS 660

English

001BA036 KN

001BA257 KN

001BA037 KN

Reactive Forces

The most common reactive forces are: kickback, pushback and pull-in.

Dangers of kickback

Kickback can result in fatal cuts.

Kickback occurs if, for example,

– The saw chain in the area of the

upper quarter of the guide bar nose unintentionally comes into contact with wood or a solid object – e. g., unintentionally touches another limb during limbing

– The saw chain at the nose of the

guide bar is briefly pinched in the cut

QuickStop chain brake:

This device reduces the risk of injury in certain situations – it cannot prevent kickback. If activated, the brake stops the saw chain within a fraction of a second – refer to chapter "Chain brake" in this Instruction Manual.

– Be especially careful with small,

tough limbs, undergrowth and offshoots – the saw chain may become caught in them

– Never cut several limbs at once

– Do not lean too far forward

– Do not cut above shoulder height

– Use extreme caution when re-

entering a previous cut

– Do not attempt plunge cuts if you

are not experienced in this cutting technique

– Be alert for shifting of the log or

other forces that may cause the cut to close and pinch the chain

– Always cut with a correctly

sharpened, properly tensioned saw chain – the depth gauge setting must not be too large

– Use low-kickback saw chains as

well as narrow-radius guide bars

Pull-in (A)

Kickback occurs when the saw is suddenly thrown up and back in an uncontrolled arc towards the operator.

Reducing the risk of kickback

– Work cautiously and methodically

– Hold the chain saw firmly with both

hands and maintain a secure grip

– Always cut at full throttle

– Be awar e of th e loc ation of the guide

bar nose

– Do not cut with the guide bar nose

When the chain on the bottom of the bar – overbucking – is suddenly pinched, caught or encounters a foreign object in the wood, the chain saw may suddenly

MS 650, MS 660

English

001BA038 KN

be drawn forward toward the log – to avoid this, engage the bumper spike firmly in the wood.

Pushback (B)

When the chain on the top of the bar – underbucking – is suddenly pinched, caught or encounters a foreign object in the wood, the chain saw may suddenly be driven straight back toward the operator – to avoid this:

– Do not allow the top of the guide bar

to become jammed

– Do not twist the guide bar in the cut

Be very careful

– With freely hanging limbs

– With trunks that are under tension

between other trees because they fell unfavourably

– When working in windbreaks

In these cases, do not use a chain saw – use a hoist, winch or dragline instead.

Pull out trunks that are lying about and have been cut free. Whenever possible, deal with them in open areas.

Dead wood (brittle, rotten or dead wood) poses a significant, highly unpredictable hazard. It is extremely difficult or even practically impossible to recognise the danger. Use aids such as winches or draglines.

When felling close to roads, rail lines, power lines, etc., work with particular care. If necessary, notify police, power companies or railway authorities.

Working Techniques

Sawing and felling work, including all related work (plunge cutting, limbing, etc.) may only be carried out by persons who have been specially trained and instructed. Persons who are not experienced chain saw users should not carry out any such work – increased risk of accidents!

Country-specific legislation on felling technique must be complied with during felling work.

Cutting

Do not operate your saw with the starting throttle lock engaged. Engine speed cannot be controlled with the throttle trigger in this position.

Work calmly and carefully – in daylight conditions and only when visibility is good. Ensure you do not endanger others – stay alert at all times.

First-time users are advised to practice cutting logs on a sawhorse – see "When cutting small logs".

Use the shortest possible guide bar: The chain, guide bar and chain sprocket must match each other and your saw.

MS 650, MS 660

English

001BA082 KN

001BA033 KN

Position the saw so that your body is clear of the cutting attachment.

Always pull the saw out of the cut with the chain running.

Use your chain saw for cutting only. It is not designed for prying or shoveling away limbs, roots or other objects.

Do not underbuck freely hanging limbs.

Take care when cutting scrub and young trees. The saw chain may catch and throw thin shoots in your direction.

To reduce the risk of injury, take special care when cutting shattered wood because of the risk of injury from slivers being caught and thrown in your direction.

Make sure your saw does not touch any foreign materials: Stones, nails, etc. may be flung off and damage the saw chain. The saw may kick back unexpectedly – risk of accidents.

If the rotating chain makes contact with a rock or other solid object there is a risk of sparking which may cause easily combustible material to catch fire under certain circumstances. Dry plants and scrub are also easily combustible, especially in hot and dry weather conditions. If there is a risk of fire, do not use your chainsaw near combustible

materials, dry plants or scrub. Always contact your local forest authority for information on a possible fire risk.

If on a slope, stand on the uphill side of the log. Watch out for rolling logs.

When working at heights:

– Always use a lift bucket

– Never work on a ladder or in a tree

– Never work on an insecure support

– Do not work above shoulder height

– Never operate your power tool with

one hand

Begin cutting with the saw at full throttle and engage the spiked bumper firmly in the wood, and then continue cutting.

Never work without the spiked bumper because the saw may pull you forwards and off balance. Always engage the spiked bumper securely in the tree or limb.

Note when reaching the end of a cut that the saw is no longer supported in the kerf. You have to take the full weight of the machine since it might otherwise go out of control.

When cutting small logs:

– Use a sturdy and stable support –

sawhorse.

– Never hold the log with your leg or

foot.

– Never allow another person to hold

the log or help in any other way.

Limbing:

– Use a low kickback chain.

– Work with the saw supported

wherever possible.

– Do not stand on the log while

limbing it.

– Do not cut with the bar nose.

– Watch for limbs which are under

tension.

– Never cut several limbs at once.

Lying or standing logs under tension:

Always make cuts in the correct sequence (first at the compression side (1), then at the tension side (2), the saw may otherwise pinch or kick back – risk of injury.

MS 650, MS 660

N Make relieving cut at the

001BA151 KN

001BA152 KN

001BA189 KN

001BA088 LÄ

1 1

compression side (1)

N Make bucking cut at the tension

side (2)

Be wary of pushback when making bucking cut from the bottom upwards (underbuck).

NOTICE

Do not cut a lying log at a point where it is touching the ground because the saw chain will otherwise be damaged.

Ripping cut:

Cutting technique in which the spiked bumper is not used – risk of pull-in – start the cut with the guide bar at the shallowest possible angle – take extra care since there is an increased danger of kickback.

Preparations for Felling

Check that there are no other persons in the felling area – other than helpers.

Make sure no-one is endangered by the falling tree – the noise of your engine may drown any warning calls.

English

Maintain a distance of at least 2 1/2 tree lengths from the next felling site.

Determining direction of fall and escape path

Select gap in stand into which you want the tree to fall.

Pay special attention to the following points:

– The natural lean of the tree

– Any unusually heavy limb structure,

damage

– The wind direction and speed – do

not fell in high winds

– Sloping ground

– Neighboring trees

– Snow load

– Soundness of tree – take special

care if trunk is damaged or in case of deadwood (dry, decayed or rotted wood)

MS 650, MS 660

English

001BA040 KN

45°

001BA146 KN

001BA271 KN

A Direction of fall B Escape path (or retreat path)

– Establish paths of escape for

everyone concerned – opposite to direction of fall at about 45°.

– Remove all obstacles from escape

paths.

– Place all tools and equipment a safe

distance away from the tree, but not on the escape paths.

– Always keep to the side of the falling

tree and only walk away along the preplanned escape path.

– On steep slopes, plan escape

routes parallel to the slope.

– When walking away along the

escape path, watch out for falling limbs and watch the top of the tree.

Preparing work area at base of tree

– First clear the tree base and work

area from interfering limbs and brush to provide a secure footing.

– Clean lower portion of tree base

(e.g. with an axe) – sand, stones and other foreign objects will dull the saw chain.

– Make the vertical cut first, then the

horizontal – but only if the wood is sound

Felling notch

Preparing felling notch

The felling notch (C) determines the direction of fall.

Important:

– Make felling notch at a right angle to

the planned direction of fall.

– Cut close to the ground.

– Cut to a depth of about 1/5 to 1/3 of

the trunk diameter.

MS 650, MS 660

English

001BA153 KN

001BA150 KN

Determine direction of fall with gunning sight on shroud and fan housing

Your chainsaw has a gunning sight on the shroud and fan housing. Use this gunning sight.

Making Felling Notch

Position the saw so that the felling notch is at a right angle to the direction you want the tree to fall.

The sequence in which the felling notch is made with a horizontal cut (bottom) and angled cut (top) is defined in country-specific regulations.

N Make horizontal cut (bottom) N Make the angled cut (top) at about

45°- 60° to the horizontal cut.

Check direction of fall

N Position the saw in the horizontal

cut. The gunning sight must point in the planned direction of fall – if necessary, correct direction of fall by re-cutting the felling notch.

Sapwood cuts

felling notch to a depth of about 1/10 of trunk diameter. On large diameter trees, cut to no more than width of guide bar.

Do not make sapwood cuts if wood is diseased.

Basic information on felling cut

Stump dimensions

1/10

001BA259 KN

MS 650, MS 660

Sapwood cuts in long-fibered softwood help prevent sapwood splintering when the tree falls. Make cuts at both sides of the trunk at same height as bottom of

The felling notch (C) determines the direction of fall.

The hinge (D) helps control the falling tree.

– Width of hinge: about 1/10 of tree

diameter.

– To reduce the risk of accidents, do

not cut through the hinge – you could lose control of the direction of fall.

– Leave a broader hinge on rotten

trees.

English

001BA269 KN

001BA270 KN

001BA260 KN

The tree is felled with the felling cut (E).

– Cut horizontally.

– 1/10 (at least 3 cm) of tree diameter

higher than bottom of felling notch (C).

The holding strap (F) or stabilizing strap (G) supports the tree and helps prevent it from falling prematurely.

– Width of strap: about 1/10 to 1/5 of

tree diameter.

– Do not cut into the strap while

making the felling cut.

– Leave a broader strap on rotten

trees.

Plunge cutting

– For relieving cuts during bucking

– For wood carving

N Use a low kickback chain and

exercise particular caution

1. Begin cut by applying the lower portion of the guide bar nose – do not use upper portion because of – risk of kickback. Start cutting at full throttle until depth of kerf is twice the width of the guide bar.

2nd Swing saw slowly into plunge-

cutting position – take care because of the risk of kickback or pushback.

3. Make the plunge cut very carefully. Danger of pushback.

Use the plunge-cutting sight if possible. The plunge-cutting sight and the top and bottom of the guide bar are parallel.

When making the plunge cut, the sight helps keep the hinge horizontal, i.e. the same thickness all round. To do this, hold the plunge-cutting sight parallel to the chord of the felling notch.

Felling wedges

Make use of wedges as soon as possible, i.e. providing they do not interfere with cutting. Drive wedge into felling cut with a suitable tool.

Use only aluminum or plastic wedges – never steel. Steel wedges can seriously damage the saw chain and cause dangerous kickback.

Select felling wedges that suit the diameter of the tree and width of the kerf (felling cut (E)).

Contact your STIHL dealer for advice on selecting the right felling wedge (length, width and height).

Choosing right felling cut

The criteria for choosing the right felling cut are the same as those for determining the direction of fall and the escape path.

There are many different variations of these characteristics. Only the two most common characteristics are described in this manual:

Left: Normal tree – vertical trunk

with uniform tree crown.

Right: Leaner – tree crown leans in

direction of fall.

Felling Cut with Stabilizing Strap (Normal Tree)

A) Small diameter trees

Perform this felling cut when the tree diameter is smaller than the length of the guide bar.

MS 650, MS 660

English

001BA261 KN

001BA273 KN

001BA263 KN

Shout a warning before starting the felling cut.

N Start felling cut (E) using plunge-cut

method – insert full length of guide bar in the trunk.

N Engage the spiked bumper behind

the hinge and use it as a pivot – avoid repositioning the saw more than necessary.

N Enlarge felling cut as far as

hinge (1).

– Do not cut into the hinge. N Enlarge felling cut as far as

– Do not cut into the stabilizing strap.

stabilizing strap (2).

MS 650, MS 660

N Insert a felling wedge (3).

Shout a second warning immediately before the tree falls.

N Holding the saw with outstretched

arms, cut through the stabilizing strap horizontally at the same level as the felling cut.

B) Large diameter trees

Perform this felling cut when the tree diameter is greater than the length of the guide bar.

Shout a warning before starting the felling cut.

N Engage the spiked bumper at the

required height of the felling cut and use it as a pivot – avoid repositioning the saw more than necessary.

N The guide bar nose enters the

wood (1) before it reaches the hinge – hold the saw horizontally and swing it as far as possible.

N Enlarge felling cut as far as

hinge (2).

– Do not cut into the hinge. N Enlarge felling cut as far as

stabilizing strap (3).

– Do not cut into the stabilizing strap.

Continue the felling cut on the other side of the trunk.

Make sure the second cut is at the same height as the first cut.

English

001BA274 KN

001BA265 KN

001BA266 KN

N Start felling cut using plunge-cut

method.

N Enlarge felling cut as far as

hinge (4).

– Do not cut into the hinge. N Enlarge felling cut as far as

stabilizing strap (5).

– Do not cut into the stabilizing strap.

N Insert a felling wedge (6).

Shout a second warning immediately before the tree falls.

N Holding the saw with outstretched

arms, cut through the stabilizing strap horizontally at the same level as the felling cut.

Felling Cut with Holding Strap (Leaner)

A) Small diameter trees

Perform this felling cut when the tree diameter is smaller than the length of the guide bar.

Shout a second warning immediately before the tree falls.

N Cut through the holding strap at a

downward angle from outside with outstretched arms.

N Plunge the guide bar into the trunk

until it emerges at the other side.

N Enlarge the felling cut (E) in

direction of hinge (1).

– Cut horizontally.

– Do not cut into the hinge.

N Enlarge the felling cut in direction of

holding strap (2).

– Cut horizontally.

– Do not cut into the holding strap.

MS 650, MS 660

English

001BA267 KN

001BA268 KN

B) Large diameter trees

Perform this felling cut when the tree diameter is greater than the length of the guide bar.

N Engage the spiked bumper behind

the holding strap and use it as a pivot – avoid repositioning the saw more than necessary.

N The guide bar nose enters the

wood (1) before it reaches the hinge – hold the saw horizontally and swing it as far as possible.

– Do not cut into the holding strap or

hinge.

N Enlarge felling cut as far as

hinge (2).

– Do not cut into the hinge. N Enlarge felling cut as far as holding

strap (3).

– Do not cut into the holding strap.

MS 650, MS 660

Continue the felling cut on the other side of the trunk.

Make sure the second cut is at the same height as the first cut.

N Engage the spiked bumper behind

the hinge and use it as a pivot – avoid repositioning the saw more than necessary.

N The guide bar nose enters the

wood (4) before it reaches the holding strap – hold the saw horizontally and swing it as far as possible.

N Enlarge felling cut as far as

hinge (5).

– Do not cut into the hinge. N Enlarge felling cut as far as holding

strap (6).

– Do not cut into the holding strap.

Shout a second warning immediately before the tree falls.

N With outstretched arms, cut through

the holding strap at a downward angle from outside.

English

001BA248 KN

001BA244 KN

001BA245 KN

Cutting Attachment

A cutting attachment consists of the saw chain, guide bar and chain sprocket.

The cutting attachment that comes standard is designed to exactly match the chain saw.

– The pitch (t) of the saw chain (1),

chain sprocket and the nose sprocket of the Rollomatic guide bar must match.

– The drive link gauge (2) of the saw

chain (1) must match the groove width of the guide bar (3).

If non-matching components are used, the cutting attachment may be damaged beyond repair after a short period of operation.

Chain Scabbard

Your saw comes standard with a chain scabbard that matches the cutting attachment.

If guide bars of different lengths are mounted to the saw, always use a chain scabbard of the correct length which covers the complete guide bar.

The length of the matching guide bars is marked on the side of the chain scabbard.

Guide bars longer than 90 cm require one scabbard extension. Guide bars longer than 120 cm require two scabbard extensions.

Depending on the model, the scabbard extension either comes standard with the saw or is available as a special accessory.

Fitting Chain Scabbard Extension

N Push the scabbard extension and

chain scabbard together – the lugs (1) must engage in the chain scabbard.

MS 650, MS 660

English

143BA034 KN

001BA185 KN

001BA186 KN

143BA003 KN

001BA187 KN

Mounting the Bar and Chain

Removing the chain sprocket cover

N Unscrew the nuts and take off the

chain sprocket cover.

N Turn the screw (1)

counterclockwise until the tensioner slide (2) butts against the left end of the housing slot.

Disengaging the chain brake.

N Pull the hand guarad towards the

front handle until there is an audible click – the chain brake is disengaged.

Fitting the chain

WARNING

Wear work gloves to protect your hands from the sharp cutters.

N Fit the chain – start at the bar nose.

N Fit the guide bar over the studs (1) –

the cutting edges on the top of the bar must point to the right.

N Engage the peg of the tensioner

slide in the locating hole (2) –- place the chain over sprocket (3) at the same time.

N Turn the tensioning

screw (4)clockwise until there is very little chain sag on the underside of the bar – and the drive link tangs are engaged in the bar groove.

N Refit the sprocket cover and screw

on the nuts only fingertight.

N Go to chapter on "Tensioning the

Saw Chain"

MS 650, MS 660

English

133BA024 KN

143BA007 KN

Tensioning the Chain

Retensioning during cutting work:

N Shut off the engine. N Loosen the nuts. N Hold the bar nose up. N Use a screwdriver to turn the

tensioning screw (1) clockwise until the chain fits snugly against the underside of the bar.

N While still holding the bar nose up,

tighten down the nuts firmly.

N Go to "Checking Chain Tension".

A new chain has to be retensioned more often than one that has been in use for some time.

N Check chain tension frequently –

see chapter on "Operating Instructions".

Checking Chain Tension

N Shut off the engine. N Wear work gloves to protect your

hands.

N The chain must fit snugly against

the underside of the bar and it must still be possible to pull the chain along the bar by hand.

N If necessary, retension the chain.

A new chain has to be retensioned more often than one that has been in use for some time.

N Check chain tension frequently –

see chapter on "Operating Instructions".

Fuel

Your engine requires a mixture of gasoline and engine oil.

WARNING

For health reasons, avoid direct skin contact with gasoline and avoid inhaling gasoline vapor.

STIHL MotoMix

STIHL recommends the use of STIHL MotoMix. This ready-to-use fuel mix contains no benzol or lead, has a high octane rating and ensures that you always use the right mix ratio.

STIHL MotoMix uses STIHL HP Ultra two-stroke engine oil for an extra long engine life.

MotoMix is not available in all markets.

Mixing Fuel

NOTICE

Unsuitable fuels or lubricants or mix ratios other than those specified may result in serious damage to the engine. Poor quality gasoline or engine oil may damage the engine, sealing rings, hoses and the fuel tank.

Gasoline

Use only high-quality brand-name gasoline with a minimum octane rating of 90 – leaded or unleaded.

MS 650, MS 660

English

143BA000 KN

Gasoline with an ethanol content of more than 10% can cause running problems in engines with a manually adjustable carburetor and should not be used in such engines.

Engines equipped with M-Tronic deliver full power when run on gasoline with an ethanol content of up to 25% (E25).

Engine Oil

If you mix the fuel yourself, use only STIHL two-stroke engine oil or another high-performance engine oil in accordance with JASO FB, JASO FC, JASO FD, ISO-L-EGB, ISO-L-EGC or ISO-L-EGD.

STIHL specifies STIHL HP Ultra twostroke engine oil or an equivalent highperformance engine oil in order to maintain emission limits over the machine’s service life.

Mix Ratio

STIHL 50:1 two-stroke engine oil: 50 parts gasoline to 1 part oil

Examples

Gasoline STIHL engine oil 50:1 Liters Liters (ml)

10.02(20) 5 0.10 (100) 10 0.20 (200) 15 0.30 (300) 20 0.40 (400) 25 0.50 (500)

N Use a canister approved for storing

fuel. Pour oil into canister first, then add gasoline and mix thoroughly.

Storing Fuel

Store fuel only in approved safety-type fuel canisters in a dry, cool and safe location protected from light and the sun.

Fuel mix ages – only mix sufficient fuel for a few weeks work. Do not store fuel mix for longer than 30 days. Exposure to light, the sun, low or high temperatures can quickly make the fuel mix unusable.

STIHL MotoMix may be stored for up to 2 years without any problems.

N Thoroughly shake the mixture in the

canister before fueling your machine.

WARNING

Pressure may build up in the canister – open it carefully.

N Clean the fuel tank and canister

from time to time.

Dispose of remaining fuel and cleaning fluid properly in accordance with local regulations and environmental requirements.

Fueling

Preparing the machine

N Before fueling, clean the filler cap

and the area around it so that dirt cannot fall into the tank.

N Always position the machine so that

the filler cap is facing upwards

N Open the filler cap

Refueling

Take care not to spill fuel while fueling and do not overfill the tank.

STIHL recommends use of the STIHL filling system for fuel (special accessory).

WARNING

After fueling, tighten down the filler cap by hand as securely as possible.

Use a suitable tool (e. g., screwdriver of the combination wrench) for slotted filler caps.

MS 650, MS 660

English

143BA009 KN

001BA158 KN

Fuel pick-up body replacement

Change the fuel pick-up body every year; to do this:

N Drain the fuel tank N Pull the fuel pick-up body out of the

tank with a hook and disconnect it from the hose

N Connect a new fuel pick-up body to

the hose

N Return the fuel pick-up body to the

tank

Chain Lubricant Filling Chain Oil Tank

For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL BioPlus is recommended.

NOTICE

Biological chain oil must be resistant to aging (e.g. STIHL BioPlus), since it will otherwise quickly turn to resin. This results in hard deposits that are difficult to remove, especially in the area of the chain drive and chain. It may even cause the oil pump to seize.

The service life of the chain and guide bar depends on the quality of the lubricant. It is therefore essential to use only a specially formulated chain lubricant.

WARNING

Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful.

NOTICE

Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication.

Preparing the machine

N Thoroughly clean the oil filler cap

and the area around it to ensure that no dirt falls into the oil tank.

N Always position the machine so that

the filler cap is facing upwards.

N Open the filler cap.

Filling the chain oil tank

Standard oil pump N Fill the chain oil tank each time the

fuel tank has been filled

Oil pump with increased delivery rate (available option)

It is necessary to check and refill the oil tank frequently – see "Adjusting the oil quantity".

N Refill the oil tank when the fuel tank

is approximately half empty

MS 650, MS 660

English

143BA024 KN

143BA011 KN

All versions

Take care not to spill chain oil while refilling and do not overfill the tank.

STIHL recommends use of the STIHL filling system for chain oil (available option).

N Close the filler cap

There must still be a small amount of oil in the oil tank when the fuel tank is empty.

If the oil tank is still partly full, the reason may be a problem in the oil supply system: Check chain lubrication, clean the oil passages, contact a servicing dealer if necessary. STIHL recommends that maintenance and repair work be carried out only by authorized STIHL dealers.

Checking Chain Lubrication

The saw chain must always throw off a small amount of oil.

NOTICE

Never operate your saw without chain lubrication. If the chain runs dry, the whole cutting attachment will be irretrievably damaged within a very short time. Always check chain lubrication and the oil level in the tank before starting work.

Every new chain has to be broken in for about 2 to 3 minutes.

After breaking in the chain, check chain tension and adjust if necessary – see "Checking Chain Tension".

Chain Brake

Locking the chain

– in an emergency

– when starting

– at idling speed

The chain brake is activated by pushing the hand guard toward the bar nose with your left hand – or by inertia in certain kickback situations: The chain is stopped and locked.

MS 650, MS 660

English

143BA012 KN

137BA014 KN

Releasing the chain brake

N Pull the hand guard back toward the

front handle,

NOTICE

Always disengage chain brake before accelerating the engine (except when checking its operation) and before starting cutting work.

High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake).

The chain brake is also activated by the inertia of the front hand guard if the kickback force of the saw is high enough: The hand guard is accelerated toward the bar nose – even if your left hand is not behind the hand guard, e.g. during felling cut.

The chain brake will operate only if the hand guard has not been modified in any way.

Check operation of the chain brake

Before starting work: Run engine at idle speed, engage the chain brake (push hand guard toward bar nose) and open the throttle wide for no more than 3 seconds – the chain must not rotate. The hand guard must be free from dirt and move freely.

Chain brake maintenance

The chain brake is subject to normal wear. It is necessary to have it serviced and maintained regularly by trained personnel. STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. Maintain the following servicing intervals:

Full-time usage: every 3

months

Part-time usage: every 6

months

Occasional usage: every 12

months

Winter Operation

At temperatures below +10 °C

N Remove the carburetor box cover

N in the carburetor box cover, move

the slide (1) from summer position to winter position (2)

Heated air is now drawn in from around the cylinder and mixed with cold air – this helps prevent carburetor icing.

NOTICE

Above +20 °C: Always return the shutter to the position for "summer operation" again! Risk of engine malfunction – overheating!

N Replace the carburetor box cover

and tighten the knob

Air filter system

N Retrofit new air filter if necessary –

see "Air filter system"

MS 650, MS 660

English

137BA015 KN

137BA016 KN

STOP

001BA140 KN

At temperatures below -10 °C

Under extreme winter conditions (temperatures below -10 °C, powdered or drifting snow), it is recommended to mount the cover plate (special accessory) on the fan housing.

The partial covering of the slits in the fan housing keeps out powdered or drifting snow.

When the cover plate is mounted, the slide must be in winter position in the carburetor box cover.

N if the chain saw is extremely cold

(frost formation) – after starting, bring the engine up to operating temperature at increased idle speed (disengage chain brake!)

N If engine trouble occurs, first check

whether use of the cover plate is necessary

Electric Handle Heating

Switching on the handle heating system (depending on equipment version)

N To switch on, set switch to F and to

switch off, return switch to the 0 position

Overheating during continuous use is impossible. The heating system is maintenance-free.

Starting / Stopping the Engine

Positions of Master Control Lever

Stop 0 – engine off – the ignition is switched off

Normal run position (F) – engine runs or can fire.

Starting throttle (n) – this position is used to start a warm engine. The Master Control lever moves to the normal run position as soon as the throttle trigger is squeezed.

Choke shutter closed (l) – this position is used to start a cold engine.

MS 650, MS 660

English

143BA018 KN

143BA019 KN

Setting the Master Control Lever

To move the Master Control lever from the normal run position (F) to choke closed (l), press down the throttle trigger lockout and squeeze the throttle trigger at the same time and hold them in that position – now set the Master Control lever.

To select the starting throttle position (n), move the Master Control lever to choke closed (l) first, then push it into the starting throttle position (n).

The Master Control lever must be in the choke closed position (l) for the changeover to the starting throttle position (n).

The Master Control lever moves from the starting throttle position (n) to the run position (F) when you press down the throttle trigger lockout and blip the throttle trigger at the same time.

To switch off the engine, move the Master Control lever to Stop (0).

Choke shutter closed (l)

– if the engine is cold

– if the engine stalls when you open

the throttle after starting.

– if the fuel tank was run until empty

(engine stopped).

Starting throttle position (n)

– if the engine is warm, i.e. if it has

been running for about one minute.

– after engine begins to fire,

– after clearing a flooded combustion

chamber.

Holding the Saw

There are two ways of holding the saw when starting.

On the ground

N Place your saw on the ground.

Make sure you have a firm footing – check that the chain is not touching any object or the ground.

N Hold the saw firmly on the ground

with your left hand on the front handle – your thumb should be under the handle.

N Put your right foot into the rear

handle and press down.

Between knees or thighs

N Hold the rear handle tightly between

your legs, just above the knees.

N Hold the front handle firmly with

your left hand – your thumb should be under the handle.

MS 650, MS 660

English

143BA020 KN

133BA001 K

STOP

178BA007 KN

Cranking

N Pull the starter grip slowly with your

right hand until you feel it engage – and then give it a brisk strong pull and push down the front handle at the same time. Do not pull out the starter rope to full length – it might otherwise break. Do not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly.

Machines without additional manual fuel pump: If the engine is new or after a long out-of-service period, it may be necessary to pull the starter rope several times to prime the fuel system.

Starting the Saw

WARNING

Bystanders must be well clear of the general work area of the saw.

N Press in the button to open the

decompression valve.

The decompression valve closes as soon as the engine fires. For this reason you must press in the button before each starting attempt.

N Push the hand guard (1) forward –

the chain is locked.

N Press down the trigger lockout (2)

and pull the throttle trigger (3) at the same time. Set Master Control lever (4) to:

Choke shutter closed (l)

– if the engine is cold (also use this

position if the engine stopped when you opened the throttle after starting)

Starting throttle position (n)

– if the engine is warm, i.e. if it has

been running for about one minute.

N Hold and start your saw as

described.

MS 650, MS 660

English

178BA008 KN

STOP

178BA009 KN

STOP

001BA186 KN

When engine begins to fire

N Set the Master Control lever (1) to

the starting throttle position (n).

N Press the button to open the

decompression valve.

N Hold and start your saw as

described.

As soon as the engine runs

N Pull the hand guard back toward the

front handle.

The chain brake is now disengaged – your saw is ready for operation.

NOTICE

Always disengage chain brake before accelerating the engine. High revs with the chain brake engaged (chain locked) will quickly damage the clutch and chain brake.

At very low outside temperatures

N Allow engine to warm up at part

throttle.

N Change over to winter operation if

necessary – see “Winter Operation”.

position (n) quickly enough after the engine began to fire, the combustion chamber may be flooded.

N Move the Master Control lever to the

stop position (0).

N Remove the spark plug – see

"Spark Plug".

N Dry the spark plug. N Crank the engine several times with

the starter to clear the combustion chamber.

N Refit the spark plug – see "Spark

Plug".

N Set Master Control lever to the

starting throttle position (n) – even if the engine is cold.

N Press the button to open the

decompression valve.

N Now start the engine.

N Press down trigger lockout and the

blip the throttle trigger (2) – the Master Control lever (1) moves to the run position (F) and the engine settles down to idling speed.

Stopping the engine

N Move the Master Control lever to the

stop position (0).

If engine does not start

If you did not move the Master Control lever from the choke closed position (l) to the starting throttle

MS 650, MS 660

English

Operating Instructions

During the break-in period

A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessarily high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the shortblock are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.

During work

NOTICE

Do not make the mixture leaner to achieve an apparent increase in power – this could damage the engine – see "Adjusting the Carburetor".

NOTICE

Open the throttle only when the chain brake is off. Running the engine at high revs with the chain brake engaged (chain locked) will quickly damage the shortblock and chain drive (clutch, chain brake).

Check chain tension frequently

A new saw chain must be retensioned more frequently than one that has been in use already for an extended period.

Chain cold

Tension is correct when the chain fits snugly against the underside of the bar but can still be pulled along the bar by hand. Retension if necessary – see "Tensioning the Saw Chain".

Chain at operating temperature

The chain stretches and begins to sag. The drive links must not come out of the bar groove on the underside of the bar – the chain may otherwise jump off the bar. Retension the chain – see "Tensioning the Saw Chain".

NOTICE

The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

After a long period of full-throttle operation

After a long period of full-throttle operation, allow engine to run for a while at idle speed so that the heat in the engine can be dissipated by flow of cooling air. This protects enginemounted components (ignition, carburetor) from thermal overload.

After finishing work

N Slacken off the chain if you have

retensioned it at operating temperature during work.

NOTICE

Always slacken off the chain again after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

Short-term storage

Wait for engine to cool down. Keep the machine with a full tank of fuel in a dry place, well away from sources of ignition, until you need it again.

Long-term storage

See "Storing the machine"

MS 650, MS 660

English

001BA157 KN

143BA026 KN

Oil Quantity Control

Varying cutting lengths, types of wood and working techniques require varying quantities of oil.

Standard oil pump

The oil delivery rate can be adjusted as needed using the adjusting screw (1) (on the bottom of the machine).

Ematic setting (E), moderate oil delivery rate –

N Turn adjusting screw to "E" (Ematic

setting)

Increase oil delivery rate – N Turn the adjusting screw clockwise

Reduce oil delivery rate – N Turn the adjusting screw

counterclockwise

NOTICE

The saw chain must always be coated with chain oil.

Oil pump with increased delivery rate (available option)

The oil pump with increased delivery rate can be identified by the groove (2) in the adjusting screw.

With this oil pump, in setting range a, the oil tank can run empty before the fuel tank, thus causing the saw chain to run dry.

N in setting range a, fill the fuel tank

only half full or refill the oil tank when the fuel tank is approximately half empty

Taking Care of the Guide Bar

N Flip the bar – after each sharpening

and each time the chain is changed – to avoid uneven wear, especially at the sprocket nose and on the bottom

N Periodically clean the oil inlet

hole (1), oil outlet channel (2) and bar groove (3)

N Measure groove depth – using the

measuring tool on the file gauge (special accessory) – in the area with the greatest wear

Chain type Chain pitch Minimum

groove depth Picco 1/4“ P 4.0 mm Rapid 1/4“ 4.0 mm

MS 650, MS 660

English

001BA210 KN

001BA212 KN

Picco 3/8“ P 5.0 mm Rapid 3/8“; 0.325“ 6.0 mm Rapid 0.404“ 7.0 mm

If the groove is not at least this deep: N Replace guide bar

Otherwise the drive links will grind against the base of the groove – the bottoms of the cutters and the tie straps will not lie against the bar.

Air Filter System

The air filter system can be adapted to different operating conditions by the insertion of different air filters. Retrofitting is simple.

N HD2-Filter (black filter frame. folded

filter fabric) Universal filter for almost all conditions of use (from very dusty to wintry conditions etc.)

Fouled air filters will impair engine performance, increase fuel consumption and make the machine more difficult to start.

MS 650, MS 660

N Wire mesh filter (green filter

housing) Use in extra-ordinary conditions e.g. extremely wintry conditions of use - such as powder snow or drift snow. Rather unsuitable in very dusty conditions.

When dry, STIHL filters attain a long service life.

N Always use STIHL filters dry

English

145BA027 K

145BA028 K

Remove Air Filter

N Turn the knob above the rear handle

in the direction of the arrow and remove the carburetor box cover

N Remove filter

Cleaning the Air Filter Adjusting the Carburetor

If there is a noticeable loss of engine power:

N Wash the filter in STIHL special-

purpose cleaner (special accessory) or a clean, nonflammable cleaning liquid (e.g., warm soapy water) – rinse the filter from inside to out under a water jet – do not use high-pressure cleaners

N Dry all filter parts – do not expose to

extreme heat

N Do not oil the filter N Reinstall filter

General Information

The carburetor comes from the factory with a standard setting.

This setting provides an optimum fuel-air mixture under most operating conditions.

Changing the setting of the high speed screw alters the engine's power output and the maximum off-load engine speed.

Standard Setting

N Shut off the engine. N Check the air filter and clean or

replace if necessary.

N Check the spark arresting screen

(not in all models, country-specific) in the m uffler and cl ean or replac e if necessary.

MS 650, MS 660

English

176BA008 KN

137BA023 KN

137BA024 KN

Carburetors with H = 1 and L = 1

N Carefully screw both adjusting

screws down onto their seats (clockwise).

N Turn the high speed screw (H) one

full turn counterclockwise.

N Turn the low speed screw (L) one

full turn counterclockwise.

Carburetors with H = 3/4 and L = 1/4

Adjusting Idle Speed

N Carry out the standard setting. N Start and warm up the engine.

Engine stops while idling N Turn the idle speed screw (LA)

clockwise until the chain begins to run – then back it off 1/4 turn.

Saw chain runs while engine is idling N Turn the idle speed screw (LA)

counterclockwise until the chain stops moving – then turn it another 1/4 turn in the same direction.

WARNING

If the chain continues moving when the engine is idling, have your saw checked and repaired by your servicing dealer.

It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).

Fine Tuning for Operation at High Altitude

A slight correction of the setting may be necessary if engine does not run satisfactorily:

N Carry out the standard setting. N Warm up the engine. N Turn the high speed screw (H)

slightly clockwise (leaner). On carburetors with H = 3/4, turn no further than stop.

NOTICE

After returning from high altitude, reset the carburetor to the standard setting.

If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating.

N Turn high speed screw (H)

counterclockwise as far as stop (no more than 3/4 turn).

N Turn the low speed screw (L)

carefully clockwise as far as stop, then turn it back 1/4 turn.

MS 650, MS 660

Erratic idling behavior, poor acceleration (even though standard setting of low speed screw is correct)

Idle setting is too lean N Turn the low speed screw (L)

counterclockwise, no further than stop on carburetors with L = 1/4, until the engine runs and accelerates smoothly.

English

137BA025 KN

137BA026 KN

178BA010 KN

137BA008 KN

Spark Arresting Screen in Muffler

In some countries, the muffler is fitted with a spark arresting screen.

N If engine performance deteriorates,

check the spark arresting screen in the muffler

N Let the muffler cool down

Version A

N Remove four screws N Remove exhaust casing (1) of the

muffler

N Clean the dirty spark arresting

screen, replace if damaged or heavily carbonized

N Refit the spark arresting screen in

reverse order of steps

Version B

In this version, the muffler is equipped with two spark arresting screens.

N Remove screw (1) N Lift and pull out the spark arresting

screen (2)

N Clean the dirty spark arresting

screen, replace if damaged or heavily carbonized

N Refit the spark arresting screen in

reverse order of steps

N Check second spark arresting

screen – as with Version A

Spark Plug

N If the engine is down on power,

difficult to start or runs poorly at idle speed, first check the spark plug.

N Fit a new spark plug after about 100

operating hours – or sooner if the electrodes are badly eroded. Install only suppressed spark plugs of the type approved by STIHL – see "Specifications".

Remove the spark plug

N Move the Master Control lever to the

stop position 0

N Turn the knob above the rear handle

in the direction of the arrow and remove the carburetor box cover

N Bend back the retaining lugs (2) N Pull out spark arresting screen (3)

MS 650, MS 660

N Lift the air baffle (1) up and off

137BA009 KN

000BA039 KN

000BA045 KN

N Unplug spark plug boot (2) N Unscrew spark plug

Checking the Spark Plug

N Clean dirty spark plug. N Check electrode gap (A) and

readjust if necessary – see "Specifications".

N Rectify the problems which have

caused fouling of the spark plug.

Possible causes are:

– Too much oil in fuel mix.

– Dirty air filter.

– Unfavorable running conditions.

WARNING

Arcing may occur if the adapter nut (1) is loose or missing. Working in an easily combustible or explosive atmosphere may cause a fire or an explosion. This can result result in serious injuries or damage to property.

N Use resistor type spark plugs with a

properly tightened adapter nut.

Install spark plug

N Screw in the spark plug and press

on the spark plug boot

N Install air baffle N Mount carburetor box cover

English

Storing the Machine

For periods of 3 months or longer N Drain and clean the fuel tank in a

well ventilated area.

N Dispose of fuel properly in

accordance with local environmental requirements.

N Run the engine until the carburetor

is dry – this helps prevent the carburetor diaphragms sticking together.

N Remove the saw chain and guide

bar, clean them and spray with corrosion inhibiting oil.

N Thoroughly clean the machine – pay

special attention to the cylinder fins and air filter.

N If you use a biological chain and bar

lubricant, e.g. STIHL BioPlus, completely fill the chain oil tank.

N Store the machine in a dry, high or

locked location, out of the reach of children and other unauthorized persons.

MS 650, MS 660

English

001BA121 KN

001BA122 KN

Checking and Replacing the Chain Sprocket

N Remove chain sprocket cover, saw

chain and guide bar.

N Release chain brake – pull hand

guard against the front handle

Fit new chain sprocket

– after use of two saw chains or

earlier

– if the wear marks (arrows) are

deeper than 0.5 mm – otherwise the service life of the saw chain is reduced – use check gauge (special accessory) to test

Using two saw chains in alternation helps preserve the chain sprocket.

STIHL recommends use of original STIHL chain sprockets in order to ensure optimal functioning of the chain brake.

N After refitting, turn the clutch drum

and/or spur chain sprocket approx. 1 full turn so that the carrier for the oil pump drive engages – with QuickStop Super chain brake, press throttle trigger lockout beforehand

N Refit the rim sprocket – cavities

toward the outside

N Refit washer and E-clip on the

crankshaft

N Use a screwdriver to remove the E-

clip (1)

N Remove the washer (2) N Remove rim sprocket (3) N Inspect transport profile on the

clutch drum (4) – if there are also heavy signs of wear, also replace the clutch drum

N Remove clutch drum or spur chain

sprocket (5) including needle cage (6) from the crankshaft – with QuickStop Super chain brake, press throttle trigger lockout beforehand

Install spur chain sprocket / rim sprocket

N Clean crankshaft stub and needle

cage and lubricate with STIHL lubricant (special accessory)

N Slide needle cage onto the

crankshaft stub

MS 650, MS 660

English

689BA027 KN

689BA021 KN

Maintaining and Sharpening the Saw Chain

Sawing effortlessly with a properly sharpened saw chain

A properly sharpened saw chain cuts through wood effortlessly even with very little pushing.

Never use a dull or damaged saw chain – this leads to increased physical strain, increased vibration load, unsatisfactory cutting results and increased wear.

N Clean the saw chain N Check the saw chain for cracks and

damaged rivets

N Replace damaged or worn chain

components and adapt these parts to the remaining parts in terms of shape and level of wear – rework accordingly

Carbide-tipped (Duro) saw chains are especially wear-resistant. For an optimal sharpening result, STIHL recommends STIHL servicing dealers.

WARNING

Compliance with the angles and dimensions listed below is absolutely necessary. An improperly sharpened saw chain – especially depth gauges that are too low – can lead to increased kickback tendency of the chain saw – risk of injury!

Chain pitch

The chain pitch marking (a) is embossed in the area of the depth gauge of each cutter.

Marking (a)Chain pitch

Inches mm 7 1/4 P 6.35 1 or 1/4 1/4 6.35 6, P or PM 3/8 P 9.32 2 or 325 0.325 8.25 3 or 3/8 3/8 9.32 4 or 404 0.404 10.26

The diameter of file to be used depends on the chain pitch – see table "Sharpening tools".

The angles of the cutter must be maintained during resharpening.

Sharpening and side plate angles

A Sharpening angle

STIHL saw chains are sharpened with a 30° sharpening angle. Ripping chains, which are sharpened with a 10° sharpening angle, are exceptions. Ripping chains have an X in the designation.

B Side plate angle

The correct side plate angle results automatically when the specified file holder and file diameter are used.

Tooth shapes Angle (°)

Micro = semi-chisel tooth, e. g., 63 PM3, 26 RM3, 36 RM

Super = full chisel tooth, e. g., 63 PS3, 26 RS, 36 RS3

Ripping chain, e. g., 63 PMX, 36 RMX

The angles must be identical for all cutters in the saw chain. Varying angles: Rough, uneven running of the saw chain, increased wear – even to the point of saw chain breakage.

30 75

30 60

10 75

MS 650, MS 660

English

689BA025 KN

001BA203 KN

689BA018 KN

90°

689BA043 KN

689BA023 KN

File holder

N Use a file holder

Always use a file holder (special accessory, see table "Sharpening tools") when sharpening saw chains by hand. File holders have markings for the sharpening angle.

Use only special saw chain files! Other files are unsuitable in terms of shape and type of cutting.

To check the angles

Proper sharpening

N Select sharpening tools in

accordance with chain pitch

N Clamp guide bar if necessary N Block saw chain – push the hand

guard forward

N To advance the saw chain, pull the

hand guard toward the handlebar: The chain brake is disengaged. With the Quickstop Super chain brake system, additionally press the throttle trigger lockout

N Sharpen frequently, removing little

ma ter ial – tw o or thre e st rok es o f the file are usually sufficient for simple resharpening

markings on the file holder – rest the file holder on the tooth head and the depth gauge

N File only from the inside outward N The file only sharpens on the

forward stroke – lift the file on the backstroke

N Do not file tie straps and drive links N Rotate the file a little periodically in

order to avoid uneven wear

N To remove file burr, use a piece of

hardwood

N Check angle with file gauge

All cutters must be equally long.

With varying cutter lengths, the cutter heights also vary and cause rough running of the saw chain and chain breakage.

N All cutters must be filed down equal

to the length of the shortest cutter – ideally, one should have this done by a servicing dealer using an electric sharpener

STIHL filing gauge (special accessory, see table "Sharpening tools") – a universal tool for checking sharpening and side plate angles, depth gauge setting, and tooth length, as well as cleaning grooves and oil inlet holes.

N Guide the file: horizontally (at a rig ht

angle to the side surface of the guide bar) in accordance with the specified angle – according to the

Depth gauge setting

The depth gauge determines the depth to which the cutter penetrates the wood and thus the chip thickness.

MS 650, MS 660

English

689BA061 KN

689BA051 KN

689BA044 KN

689BA052 KN

a Required distance between depth

gauge and cutting edge

When cutting softwood outside of the frost season, the distance can be increased by up to 0.2 mm (0.008").

Chain pitch Depth gauge

Distance (a) Inches (mm) mm (Inches) 1/4 P (6.35) 0.45 (0.018) 1/4 (6.35) 0.65 (0.026) 3/8 P (9.32) 0.65 (0.026)

0.325 (8.25) 0.65 (0.026) 3/8 (9.32) 0.65 (0.026)

0.404 (10.26) 0.80 (0.031)

Lowering the depth gauges

The depth gauge setting is lowered when the cutter is sharpened.

N Check the depth gauge setting after

each sharpening

Saw chains with humped drive link (2) – upper part of the humped drive link (2) (with service mark) is lowered at the same time as the depth gauge of the cutter.

WARNING

The rest of the humped drive link must not be filed; otherwise, this could increase the tendency of the chain saw to kick back.

N Rework th e depth gauge so that it is

flush with the file gauge

WARNING

Depth gauges that are too low increase the kickback tendency of the chain saw.

N Lay the file gauge on the saw chain

– the highest point of the depth gauge must be flush with the file gauge

N After sharpening, clean the saw

chain thoroughly, removing any filings or grinding dust – lubricate the saw chain thoroughly

N In the event of extended periods of

disuse, store saw chains in cleaned and oiled condition

N Lay the appropriate file gauge (1)

for the chain pitch on the saw chain and press it against the cutter to be checked – if the depth gauge protrudes past the file gauge, the depth gauge must be reworked

MS 650, MS 660

N Afterwards, dress the leading edge

of the depth gauge parallel to the service mark (see arrow) – when doing this, be careful not to further lower the highest point of the depth gauge

English

Sharpening tools (special accessories) Chain pitch Round file ^ Round file File holder File gauge Taper square file Sharpening set Inches (mm) mm (Inches) Part number Part number Part number Part number Part number 1/4P (6.35) 3.2 (1/8) 5605 771 3206 5605 750 4300 0000 893 4005 0814 252 3356 5605 007 1000 1/4 (6.35) 4.0 (5/32) 5605 772 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 007 1027 3/8 P (9.32) 4.0 (5/32) 5605 772 4006 5605 750 4327 1110 893 4000 0814 252 3356 5605 007 1027

0.325 (8.25) 4.8 (3/16) 5605 772 4806 5605 750 4328 1110 893 4000 0814 252 3356 5605 007 1028 3/8 (9.32) 5.2 (13/64) 5605 772 5206 5605 750 4329 1110 893 4000 0814 252 3356 5605 007 1029

0.404 (10.26) 5.5 (7/32) 5605 772 5506 5605 750 4330 1106 893 4000 0814 252 3356 5605 007 1030

consisting of file holder with round file, taper square file and file gauge

MS 650, MS 660

Maintenance and Care

The following maintenance intervals apply to normal usage and operating conditions. If your daily working time is longer or operating conditions are difficult (very dusty work area, resin-rich wood, tropical wood, etc.), shorten the specified intervals accordingly. If you only use your power tool occasionally, extend the intervals accordingly.

before starting work

after finishing work or daily

after each refueling stop

weekly

Complete machine

Throttle trigger, trigger lockout, choke lever, stop switch, Master Control lever (depending on version)

Chain brake

Manual fuel pump (if fitted)

Pickup body/filter in fuel tank

Fuel tank Clean X

Chain oil tank Clean X

Chain lubrication Check X

Chain

Guide bar

Chain sprocket Check X

Air filter

Visual inspection (condition, leaks) XX

Clean X

Check operation XX

Have checked by servicing dealer

Check X

Have repaired by servicing dealer

Check X

Clean, replace filter element XX

Replace XXX

Inspect, also check sharpness XX

Check chain tension XX

Sharpen X

Check (wear, damage) X

Clean and turn over X

Deburr X

Replace XX

Clean XX

Replace X

monthly

English

every 12 months

if problem

if damaged

as required

MS 650, MS 660

English

before starting work

after finishing work or daily

after each refueling stop

weekly

monthly

every 12 months

if problem

if damaged

as required

Antivibration elements

Air inlet on fan housing Clean XX X

Cylinder fins Clean XX X

Carburetor

Spark plug

All accessible screws and nuts (not adjusting screws)

Chain catcher

Exhaust port

Safety labels Replace X

STIHL recommends a STIHL servicing dealer

Firmly tighten down the cylinder base screws of professional saws (3.4 kW or more) after 10 to 20 hours of operation.

Check XX

Have replaced by servicing dealer

Check idle adjustment – chain must not rotate XX

Adjust idle speed; if necessary, have saw serviced or repaired by dealer

Readjust electrode gap X

Replace after every 100 hours of operation

Retighten

Check X

Replace X

Decoke after first 139 hours of operation, then every 150 hours of operation

MS 650, MS 660

English

Minimize Wear and Avoid Damage

Observing the instructions in this manual helps reduce the risk of unnecessary wear and damage to the power tool.

The power tool must be operated, maintained and stored with the due care and attention described in this owner's manual.

The user is responsible for all damage caused by non-observance of the safety precautions, operating and maintenance instructions in this manual. This includes in particular:

– Alterations or modifications to the

product not approved by STIHL.

– Using tools or accessories which

are neither approved or suitable for the product or are of a poor quality.

– Using the product for purposes for

which it was not designed.

– Using the product for sports or

competitive events.

– Consequential damage caused by

continuing to use the product with defective components.

Maintenance Work

All the operations described in the "Maintenance Chart" must be performed on a regular basis. If these maintenance operations cannot be performed by the owner, they should be performed by a servicing dealer.

STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL

servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.

If these maintenance operations are not carried out as specified, the user assumes responsibility for any damage that may occur. Among other parts, this includes:

– Damage to the engine due to

neglect or deficient maintenance (e.g. air and fuel filters), incorrect carburetor adjustment or inadequate cleaning of cooling air inlets (intake ports, cylinder fins).

– Corrosion and other consequential

damage resulting from improper storage.

– Damage to the machine resulting

from the use of poor quality replacement parts.

Parts Subject to Wear and Tear

Some parts of the power tool are subject to normal wear and tear even during regular operation in accordance with instructions and, depending on the type and duration of use, have to be replaced in good time. Among other parts, this includes:

– Saw chain, guide bar

– Drive components (clutch, clutch

drum, chain sprocket)

– Filters (air, oil, fuel)

– Starter mechanism

– Spark plug

– Components of antivibration system

MS 650, MS 660

English

178BA004 KN

Main Parts

1 Carburetor box cover twist lock 2 Spark plug boot 3 Carburetor adjusting screws 4 Handle heating switch (depending

on equipment version) 5 Chain sprocket cover 6 Chain sprocket 7 Chain brake 8 Chain tensioner 9 Chain catcher 10 Bumper spike 11 Guide bar 12 Oilomatic saw chain 13 Oil filler cap 14 Muffler 15 Front hand guard 16 Front handle (handlebar) 17 Decompression valve 18 Starter grip 19 Fuel tank twist lock 20 Master Control lever 21 Throttle trigger 22 Throttle trigger interlock 23 Rear handle 24 Rear hand guard # Serial number

MS 650, MS 660

English

Specifications

Engine

STIHL single cylinder two-stroke engine

MS 650

Displacement: 84.9 cc Bore: 52 mm Stroke: 40.0 mm Engine power to ISO 7293: MS 650: 4.8 kW (6.5 bhp)

at 9,500 rpm

MS 650 Magnum: 4.9 kW (6.7 bhp)

Idle speed:

MS 660

Displacement: 91.6 cc Bore: 54 mm Stroke: 40.0 mm Engine power to ISO 7293: MS 660: 5.2 kW (7.1 bhp)

MS 660 Magnum: 5.6 kW (7.6 bhp)

Idle speed:

to ISO 11681 +/- 50 rpm

Ignition System

Electronic magneto ignition

Spark plug (resistor type):

Electrode gap: 0.5 mm

at 9,500 rpm 2,500 rpm

at 9,500 rpm

at 9,500 rpm 2,500 rpm

NGK BPMR 7 A, Bosch WSR 6 F

Fuel System

All position diaphragm carburetor with integral fuel pump

Fuel tank capacity: 825 cc (0.825 l)

Chain Lubrication

Fully automatic, speed-controlled oil pump with rotary piston. Additional manual oil flow control

Oil tank capacity: 360 cc (0.36 l)

Weight

dry, without bar and chain MS 650: 7.3 kg MS 650 Magnum: 7.5 kg MS 660: 7.3 kg MS 660 Magnum: 7.5 kg MS 660 with handle heating: 7.5 kg

Cutting Attachment

Actual cutting length may be less than the specified length

Rollomatic E 3/8" guide bars

Cutting lengths: 40, 45, 50, 63, 75,

80, 90 cm Pitch: 3/8" Groove width: 1.6 mm Nose sprocket: 11-tooth

Rollomatic E .404" guide bars

Cutting lengths: 50, 63, 80 cm Pitch: 404" Groove width: 1.6 mm Nose sprocket: 12-tooth

3/8" chains

Rapid Micro (36 RM) Type 3652 Rapid Super (36 RS) Type 3621 Rapid Super 3 (36 RS3) Type 3626 Pitch: 3/8" (9.32 mm) Drive link gauge: 1.6 mm

.404" chain

Rapid Micro (46 RM) Type 3668 Rapid Super (46 RS) Type 3946 Pitch: .404" (10.26 mm) Drive link gauge: 1.6 mm

Chain sprockets

7-tooth for 3/8" (rim sprocket) Max. chain velocity to

ISO 11681: 27,5 m/s Chain speed at maximum

power output: 21,7 m/s

7-tooth for 3/8" P (spur sprocket) Max. chain velocity to

ISO 11681: 27,5 m/s Chain speed at maximum

power output: 21,7 m/s

7-tooth for 404" (rim sprocket) Max. chain velocity to

ISO 11681: 30,2 m/s Chain speed at maximum

power output: 23,9 m/s

MS 650, MS 660

English

Noise and Vibration Data

For further details on compliance with Vibration Directive 2002/44/EC see www.stihl.com/vib.

Sound pressure level L

to ISO 22868

peq

MS 650: 100 dB(A)

Sound pressure level L

to ISO 22868

peq

MS 660: 101 dB(A)

Sound power level L

to ISO 22868

MS 650: 115 dB(A) MS 660: 112 dB(A)

Vibration measurement a

hv,eq

ISO 22867

Handle,

left MS 650: 6.7 m/s MS 660: 7.0 m/s27.0 m/s

Handle, right

6.7 m/s

The K-factor in accordance with Directive 2006/42/EC is 2.0 dB(A) for the sound pressure level and sound power level; the K-factor in accordance with Directive 2006/42/EC is 2.0 m/s

for the vibration level.

Exhaust Emissions

The CO2value measured in the EU type approval procedure is specified at www.stihl.com/co2.

The measured CO

value was

determined on a representative engine in accordance with a standardized test procedure under laboratory conditions and does not represent either an explicit or implied guarantee of the performance of a specific engine.

The applicable exhaust emission requirements are fulfilled by the intended usage and maintenance described in this instruction manual. The type approval expires if the engine is modified in any way.

Ordering Spare Parts

Please enter your saw model, serial number as well as the part numbers of the guide bar and saw chain in the spaces provided. This will make reordering simpler.

The guide bar and saw chain are subject to normal wear and tear. When purchasing these parts, always quote the saw model, the part numbers and names of the parts.

Model

Serial number

Guide bar part number

Chain part number

REACH

REACH is an EC regulation and stands for the Registration, Evaluation, Authorisation and Restriction of Chemical substances.

For information on compliance with the REACH regulation (EC) No. 1907/2006 see www.stihl.com/reach.

MS 650, MS 660

English

000BA073 KN

Maintenance and Repairs Disposal

Users of this machine may only carry out the maintenance and service work described in this user manual. All other repairs must be carried out by a servicing dealer.

STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer. STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information.

When repairing the machine, only use replacement parts which have been approved by STIHL for this power tool or are technically identical. Only use highquality replacement parts in order to avoid the risk of accidents and damage to the machine.

STIHL recommends the use of original STIHL replacement parts.

Original STIHL parts can be identified by the STIHL part number, the { logo and the STIHL parts symbol K (the symbol may appear alone on small parts).

Observe all country-specific waste disposal rules and regulations.

STIHL products must not be thrown in the garbage can. Take the product, accessories and packaging to an approved disposal site for environmentfriendly recycling.

Contact your STIHL servicing dealer for the latest information on waste disposal.

EC Declaration of Conformity

ANDREAS STIHL AG & Co. KG Badstr. 115 D-71336 Waiblingen

Germany

declare in exclusive responsibility that the product

Category: Chain saw Make: STIHL Model: MS 650

MS 660 MS 660-N

MS 660-W Serial identification: 1122 Displacement MS 650: 84.9 cc all MS 660: 91.6 cc

conforms to the relevant provisions of Directives 2006/42/EC, 2014/30/EU and 2000/14/EC and has been developed and manufactured in compliance with the following standards in the versions valid on the date of production:

EN ISO 11681-1, EN 55012, EN 61000-6-1

The measured and guaranteed sound power levels were determined according to Directive 2000/14/EC, Annex V, using the ISO 9207 standard.

Measured sound power level

MS 650, MS 660

MS 650: 116 dB(A) all MS 660: 117 dB(A)

English

Guaranteed sound power level

MS 650: 117 dB(A) all MS 660: 118 dB(A)

The EC type examination was carried out by

DPLF Deutsche Prüf- und Zertifizierungsstelle für Land- und Forsttechnik GbR (NB 0363) Spremberger Straße 1 D-64823 Groß-Umstadt

Certification No. MS 650: K-EG-2009/3925 all MS 660: K-EG-2009/3619

Technical documents deposited at:

ANDREAS STIHL AG & Co. KG Produktzulassung (Product Licensing)

The year of manufacture and serial number are applied to the product.

Done at Waiblingen, 28.10.2016

ANDREAS STIHL AG & Co. KG

Thomas Elsner

Director Product Management and Services

MS 650, MS 660

0458-178-0121-B

englisch

www.stihl.com

*04581780121B*

0458-178-0121-B

Stihl MS 650, MS 660 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual