Ryobi RCS-3540C User manual

PETROL CHAIN SAW
OPERATOR’S MANUAL
RCS-3540C / 4046C / 4450C
Important !
It is essential that you read the instructions in this manual before mounting and
operating this machine.

Fig. 1
1
2
3
4
56
7
910 11
17
15
14
13
12
Fig. 2 Fig. 3
16
8
18

Fig. 57
Fig. 60
Fig. 59
Fig. 58
A
A
B
D
C
C
Fig. 63
Fig. 62
A
B
“T“
Fig. 61

Fig. 72
Fig. 71
A
BC
D

1
Thank you for buying a Ryobi chainsaw.
Yournewchainsawhasbeenengineeredandmanufactured
toRyobi’shighstandardfordependability, easeofoperation,
andoperatorsafety. Properly cared for, it willgiveyou years
of rugged, trouble-free performance.
WARNING
To reduce the risk of injury, the user must read and
understand the operator’s manual.
IMPORTANT
Servicing requires extreme care and knowledge
and should be performed only by a qualified service
technician. When servicing use only identical Ryobi
replacement parts. For safe operation, read and
understand all instructions before using the chainsaw.
Follow all safety instructions. Failure to follow all safety
instructions listed below may result in serious personal
injury.
WARNING
Carefully read through this entire operator’s manual
before using your new saw. Pay close attention to the
Safety Rules and all Safety Alert Symbols including
Danger, Warning, and Caution. These safety rules are
for your safety and to prevent possible serious injury.
If you use your saw properly and only for what it is
intended,
you will enjoy years of safe, reliable service.
WARNING
Look for this symbol to point out important safety
precautions. It means attention!!! Your safety is
involved.
WARNING
The operation of any tool can result in foreign objects
being thrown into your eyes which may result in severe
eye damage. Before beginning tool operation, always
wear safety goggles or safety glasses with side shields
and a full face shield when needed. We recommend
Wide Vision Safety Mask for use over spectacles or
standard safety glasses with side shields.
Always wear eye protection.
READ ALL INSTRUCTIONS.
GENERAL SAFETY RULES
WARNING
The warnings, labels, and instructions found in this
section of the operator’s manual are for your safety.
Failure to follow all instructions may result in serious
personal injury. Safe operation of this tool requires that
you read and understand this operator’s manual and
all labels affixed to the tool. Safety is a combination of
using common sense, staying alert, and knowing how
your saw works.
■KNOW YOUR TOOL. Read the operator’s manual
carefully. Learn the saw’s applications and limitations
as well as the specific potential hazards related to this
tool.
■CHAINSAWS are designed for cutting wood only.
■KICK-BACK MAY OCCUR WHEN THE NOSE OF THE
GUIDE BAR touches an object or when the wood closes
inandpinchesthesawchaininthecut.Thenoseofguide
bar contact in some cases may cause a lightning-fast
reversereaction kicking theguidebarupand back toward
the operator. Pinching the saw chain along the top of the
guidebar may push the guide bar rapidly back toward the
operator.Either of these reactions may causeyou to lose
control of the saw which could result in serious personal
injury. DO NOT rely exclusively upon the safety devices
built into your saw. As a chainsaw user, you should take
severalstepstokeepyourcuttingjobsfreefrom accident
or injury.
1. With a basic understanding of kick-back, you can
reduce or eliminate the element of surprise. Sudden
surprise contributes to accidents.
2.Keep a good firm griponthesaw with both hands when
the engine is running. Place your right hand on the rear
handle and your left hand on the front handle with your
thumbs and fingers encircling the chainsaw handles. A
firmgrip together withastiffleftarm will help you maintain
control of the saw if kick-back occurs.
3. Make sure that the area in which you are cutting is free
from obstructions. DO NOT let the nose of the guide bar
contact a log, branch, fence, or any other obstruction
that could be hit while you are operating the saw.
4. Cut at high engine speeds. Always cut with the engine
running at full speed. Fully squeeze the throttle trigger
and maintain a steady cutting speed.
5. Do not overreach or cut above chest height.
6.Follow themanufacturer’ssharpening and maintenance
instructions for the saw chain.
7.Useonlyreplacement bars and chains specified by the
manufacturer or the equivalent.
■DO NOT OPERATE A CHAINSAW WITH ONE HAND.
SAFETY RULES

2
Seriousinjurytotheoperator,helpers, and/or bystanders
may result from one-handed operation. A chainsaw is
intended for two-handed use.
■DO NOT OPERATE A CHAINSAW WHEN YOU ARE
FATIGUED. Neveroperate a chainsaw when you aretired
or under the influence of medication, drugs, or alcohol.
■USE SAFETY FOOTWEAR. Wear snug-fitting clothing,
protective gloves, and eye, hearing, and head protection
devices.
■DO NOT STAND ON ANY UNSTABLE SURFACE while
using your chainsaw: that includes ladders, scaffolds,
trees, etc.
■USE CAUTION WHEN HANDLING FUEL. Move the
chainsaw at least 50 feet (15 m) from the refuelling point
before starting the engine.
■DO NOT ALLOW OTHER PERSONS to be near the
chainsaw when starting or cutting with the chainsaw.
Keep bystanders and animals out of the work area.
■DO NOT START CUTTING until you have a clear work
area, secure footing, and a planned retreat path from the
falling tree.
■KEEP ALL PARTS OF YOUR BODY away from the saw
chain when the engine is running.
■ALWAYS CARRY THE CHAINSAW WITH THE ENGINE
STOPPED AND THE BRAKE ENGAGED, the guide bar
and saw chain to the rear, and the silencer away from
your body. When transporting the chainsaw, use the
appropriate guide bar scabbard.
■DO NOT OPERATE A CHAINSAW THAT IS DAMAGED,
improperly adjusted, or not completely and securely
assembled. Be sure that the saw chain stops moving
when the throttle control trigger is released.
■TURN OFF THE ENGINE before putting the chainsaw
down. DO NOT leave the engine running unattended. As
an additional safety precaution, apply the chain brake
before putting down the saw.
■USE EXTREME CAUTION whencutting small-size brush
and saplings because slender material may catch the
saw chain and be whipped toward you or pull you off
balance.
■WHEN CUTTING A LIMB under tension, be alert for
spring-back so that you will not be struck when the
tension in the wood fibres is released.
■KEEP THE HANDLES dry, clean, and free of oil or fuel
mixture.
■OPERATE THE CHAINSAW ONLY in well-ventilated
areas.
■DO NOT OPERATE A CHAINSAW IN A TREE unless
you have been specifically trained to do so.
■ALWAYS HAVE A FIRE EXTINGUISHER AVAILABLE
WHEN USING CHAIN SAW.
■ Use guide bar cover during transport and storage.
■ The chain saw should always be used with correctly
mounted spiked bumper.
■FOLLOW THE SHARPENING and maintenance
instructions for the saw chain.
■USE ONLY THE REPLACEMENT GUIDE BARS andlow
kick-back chains specified for your saw.
■DO NOT adapt your powerhead to a bow guide or use it
to power any attachments or devices not listed for your
saw.
■SAVE THESE INSTRUCTIONS. Refertothemfrequently
and use to instruct other users. If you lend someone this
tool, lend them these instructions also.
SPECIFIC SAFETY RULES
WARNING
The warnings, labels, and instructions found in this
section of the operator’s manual are for your safety.
Failure to follow all instructions may result in serious
personal injury.
GENERAL PRECAUTIONS
■DO NOT CUT VINES and/orsmall undergrowth (less than
76 mm (3 in.) in diameter).
■MUFFLER SURFACES ARE VERY HOT duringandafter
operationofthechainsaw; keep all body parts away from
the muffler. Serious burns may occur if contact is made
with the muffler.
■ALWAYS HOLD THE CHAINSAW WITH BOTH HANDS
when the engine is running. Use a firm grip with thumbs
and fingers encircling the chainsaw handles.
■NEVER LET ANYONE USE YOUR CHAINSAW whohas
notreceived adequate instructions in itsproper use. This
applies to rentals as well as privately owned saws.
■BEFORE YOU START THE ENGINE, makesurethe saw
chain is not contacting any object.
■OPERATE THE CHAINSAW only in well ventilated
areas.
PROPER CLOTHING FOR SAFETY
■Wear close-fitting clothing. Always wear heavy, long
trousers,boots, and gloves. Donotwearjewellery, shorts,
sandals,or gobarefoot.Donot wear loose-fittingclothing,
which could be drawn into the engine or catch the chain
or undergrowth. Wear overalls, jeans, or leggings made
ofcut-resistant material or ones that contain cut-resistant
inserts. Secure hair so that it is above shoulder level.
■Wear non-slip safety footwear and heavy-duty gloves to
improve your grip and to protect your hands.
■Wear eye, hearing, and head protection when operating
this equipment.
SAFETY RULES

3
SAFETY RULES
REFUELLING (DO NOT SMOKE!)
■To reduce the risk of fire and burn injury, handle fuel with
care. It is highly flammable.
■Mix and store fuel in a container approved for petrol.
■Mix fuel outdoors where there are no sparks or flames.
■Select bare ground, stop the engine, and allow it to cool
before refuelling.
■Loosen the fuel cap slowly to release pressure and to
keep fuel from escaping around the cap.
■Tighten the fuel cap securely after refuelling.
■Wipe spilled fuel from the unit. Move 15 m (50 ft.) away
from refuelling site before starting engine.
■Never attempt to burn off spilled fuel under any
circumstances.
BASIC PRECAUTIONS IN THE CUTTING/
WORK AREA
■Do not operate a chainsaw in a tree.
■Do not cut from a ladder: this is extremely dangerous.
■Keep bystanders and animals out of the work area. Do
not allow other persons to be nearby during starting or
cutting with the chainsaw.
NOTE:The size of the work area depends onthejobbeing
performed as well as the size tree or workpiece involved.
Forexample, felling a tree requires a larger workareathan
making other cuts, i.e. bucking cuts etc.
PUSH AND PULL
The reaction force is always opposite to the direction the
chainismoving.Thus,theoperatormust be ready to control
the PULL when cutting on the bottom edge of the bar and
the PUSH when cutting along the top edge.
NOTE: Your chainsaw has been fully factory tested.
It is normal to find some slight oil residue on the saw.
MAINTENANCE PRECAUTIONS
Never operate a chainsaw that is damaged, improperly
adjusted, or is not completely and securely assembled.
Be sure that the saw chain stops moving when the throttle
control trigger is released. If the saw chain moves at
idling speed, the carburettor may need adjusting. Refer to
“Operation-Adjusting Idling Speed” later in this manual.
If the saw chain still moves at idling speed after adjustment
hasbeenmade,contactaRyobiservicedealerforadjustment
and discontinue use until the repair is made.
WARNING
All chainsaw service, other than items in the operator’s
manualmaintenance instructions, should be performed
by competent chainsaw service personnel. If improper
tools are used to remove the flywheel or clutch, or if an
improper tool is used to hold the flywheel in order to
remove the clutch, structural damage to the flywheel
could occur which could subsequently cause the
flywheel to burst and serious injury could result.
KICK-BACK
Kick-back is a dangerous reaction that can lead to serious
injury. Do not rely only on the safety devices provided
with your saw. As a chainsaw user, you must take special
safety precautions to help keep your cutting jobs free from
accident or injury.
NOTE: Refer to “Operation” later in this manual for added
informationonkick-backandhowtoavoid serious personal
injury.
SAVE THIS MANUAL FOR FUTURE
REFERENCE.

4
Someof thefollowingsymbols maybeused onthistool. Pleasestudythem andlearntheir meaning.Properinterpretation
of these symbols will allow you to operate the tool better and safer.
Read The Operator’s Manual
Safety Alert
SYMBOL NAME DESIGNATION/EXPLANATION
To reduce the risk of injury, user must read and understand
operator’s manual before using this product.
Precautions that involve your safety.
Wear Eye, Hearing, and Head
Protection
Wear eye, hearing and head protection when operating this
equipment.
Petrol and Oil
Use unleaded petrol intended for motor vehicle use with an
octane rating of 87 [(R + M)/2] or higher. This product is powered
by 2-stroke cycl e engine and requires pre-mixing petrol and
2 -stroke oil.
Wear non-slip, heavy-duty protective gloves when handling the
chain saw.
Avoid bar nose contact.
DANGER! Beware of kickback.
Engines produce carbon monoxide which is an odorless, deadly
poison. Do not operate in an enclosed area.
Do not operate the saw using only one hand.
Hold and operate the saw properly with both hands.
No smoking, sparks, or open flame.
Wear Gloves
Bar Nose Contact
Kickback
Carbon Monoxide
One Handed
Operate With Two Hands
No Smoking
Keep Bystanders Away Keep all bystanders and animals at least 15m away.
SYMBOLS

5
RCS-3540C RCS-4046C RCS-4450C
35 cc 40 cc 44 cc
Weight - No bar, chain, fuel or oil 4.6 kg 4.6 kg 4.6 kg
Fuel tank capacity 310 cm3310 cm3310 cm3
Oil tank capacity 210 cm3210 cm3210 cm3
Bar lengths 40 cm 46 cm 50 cm
Usable cutting lengths 370 mm 410 mm 475 mm
Bar type Carlton 16-10-N1-MHC UNB Carlton 18-10-N1-MHC UNB Carlton 20-10W-K1-HC-UNB
Chain pitch 9.53mm (0.375 inch) 9.53mm (0.375 inch) 8.26mm (0.325 inch)
Chain gauge 1.27 mm (0.05 inch) 1.27 mm (0.05 inch) 1.27 mm (0.05 inch)
Chain type Carlton N1C-BL-M-57E SK Carlton N1C-BL-M-62E SK Carlton K1L-BL-78E
Chain Speed 14m / Sec 14m / Sec 14m / Sec
Drive sprocket 6-tooth 6-tooth 7-tooth
Engine displacement 35 cm340.1 cm344 cm3
Maximum engine power (ISO7293) 1.7 kW / 10000 min-1 1.8 kW / 10000 min-1 1.9 kW / 9500 min-1
Maximum engine speed with attachment 12000 min-1 12000 min-1 12000 min-1
Idling engine speed 2700 - 3100 min-1 2700 - 3100 min-1 2700 - 3100 min-1
Specific fuel consumption at maximum engine power 435g/kwh 435g/kwh 435g/kwh
Sound pressure level(ISO22868) 103 dB(A) 103 dB(A) 103 dB(A)
Sound power level (ISO22868) 113 dB(A) 113 dB(A) 113 dB(A)
Vibration (ISO22867)
- Front Handle 6.4 m/s26.4 m/s26.4 m/s2
- Rear Handle 7.0 m/s27.0 m/s27.0 m/s2
SPECIFICATIONS
DESCRIPTION
See Figure 1.
1. Front hand guard / Chain Brake
2. Front handle
3. Cylinder cover
4. Primer bulb
5. Choke knob
6. Clutch cover
7. Bar mounting nuts
8. Guide bar
9. Low kickback saw chain
ASSEMBLY
10. Starter / fan housing
11. Starter grip
12. Ignition switch
13. Trigger release
14. Rear handle
15. Throttle trigger
16. Chain oil cap
17. Fuel cap
18. Spiked bumper
WARNING
If any parts are damaged or missing do not operate
this tool until the parts are replaced. Failure to heed
this warning could result in serious personal injury.
WARNING
Donotattempttomodifythistoolorcreateaccessories
not recommended for use with this tool. Any such
alteration or modification is misuse and could result
in a hazardous condition leading to possible serious
personal injury.
NOTE: Thechainsawhasbeenfullyfactorytested.Itisnormal
to find some slight oil residue on the saw. Read and remove
all hang tags and store with the Operator’s Manual.
See Figure 34-43.
Read the replacing the guide bar and chain section later in
this manual.

6
■ This engine is certified to operate on unleaded petrol
intended for motor vehicle use with an octane rating of
87 [(R + M) / 2] or higher.
■ Do not use any type of pre-mixed petrol/oil from fuel
service stations, This includes the pre-mixed petrol/oil
intended for use in mopeds, motorcycles, etc.
■ Use synthetic 2-stroke oil only.
■ Mix 2% oil into the petrol. This is a 50:1 ratio.
■ Mix the fuel thoroughly and alsoeach time before
refueling.
■ Mix in small quantities. Do not mix quantities larger
than usable in a 30 day period. A synthetic 2-stroke oil
containing a fuel stabilizer is recommended.
FILLING THE FUEL TANK (FIG. 2)
■ Clean surface around fuel cap to prevent contamination.
■ Loosen the fuel cap slowly to release pressure and to
keep fuel from escaping around the cap.
■
Carefully pour the fuel mixture into the tank. Avoid spillage.
■ Prior to replacing the fuel cap, clean and inspect the
o-ring.
■ Immediately replace the fuel cap and hand tighten. Wipe
up any fuel spillage. Move 9 m (30 ft) away from refueling
site before starting engine.
NOTE: It is normal for the engine to emit smoke during and
after the first use.
ADDING BAR AND CHAIN OIL
See Figure 3.
Use Ryobi Bar and Chain Oil. It is designed for chains
and chain oilers, and is formulated to perform over a wide
temperature range with no dilution required. Chain saw
should use approximately one tank of oil per tank of fuel.
NOTE: Do not use dirty, used, or otherwise contaminated
oils. Damage may occur to the oil pump, bar, or chain.
■ Carefully pour the bar and chain oil into the oil tank.
■ Fill the oil tank every time you fuel the engine.
WARNING
Do notallow familiarity withtools to makeyou careless.
Remember that a careless fraction of a second is
sufficient to inflict serious injury.
WARNING
Always wear safety goggles or safety glasses with
side shields when operating this tool. Failure to do
so could result in objects being thrown into your eyes
resulting in possible serious injury.
WARNING
Do not use any attachments or accessories not
recommended by the manufacturer of this tool. The
use of attachments or accessories not recommended
can result in serious personal injury.
APPLICATIONS
You may use this tool for the purposes listed below:
■ Basic limbing, felling, and woodcutting
■ Removing buttress roots
FUEL AND REFUELING
HANDLING THE FUEL SAFELY
WARNING
Always shutoff engine beforefueling. Never addfuel to
a machine with a running or hot engine. Move at least
9 m. from refueling site before starting the engine. DO
NOT SMOKE! Failure to heed this warning can result
in possible personal injury.
WARNING
Check for fuel leaks. If any are found, correct them
before using the saw to prevent fire or burn injury.
■ Always handle fuel with care; it is highly flammable.
■ Always refuel outdoors where there are no sparks and
flames. Do not inhale fuel vapour.
■ Do not let petrol or oil come in contact with skin.
■ Keep petrol and oil away from the eyes. If petrol or oil
comes in contact with the eyes, wash them immediately
with clean water. If irritation is still present, see a doctor
immediately.
■ Clean up spilled fuel immediately.
MIXING THE FUEL
■ Thisproduct is poweredbya2-stroke engine andrequires
pre-mixing petrol and synthetic 2-stroke oil. Pre-mix
unleaded petrol and synthetic 2-stroke engine oil in a
clean container approved for petrol.
OPERATION
1 Litre + 20 ml =
2 Litres + 40 ml =
3 Litres + 60 ml =
4 Litres + 80 ml =
5 Litres + 100 ml =
50:1

7
To Start a Warm Engine:
■ Set the ignition switch to the RUN ( I ) position.
■ Makesurethechain brake is in the run positionbypulling
back on the lever/hand guard.
■ Fully press and release the primer bulb 4 times.
■ Pull starter grip until engine runs.
STOPPING THE ENGINE
See Figures 11 - 12.
Release the throttle trigger and let the engine return to
idle. To stop the engine, move the ignition switch to the
STOP ( )position.Donotput the chain saw on the ground
when the chain is still moving. For additional safety, set the
chain brake when the saw is not in use.
In the event that the ignition switch will not stop the saw,
pullthe choke knob out to thefully extended position (FULL
CHOKE/ ) and engage chain brake to stop the engine.
If the ignition switch will not stop the saw when set to the
STOP position, have the ignition switch repaired before
using the chain saw again to prevent unsafe conditions or
serious injury.
NOTE: Whenyouarefinishedusingthesaw,always relieve
tank pressure by loosening, then retightening, the chain oil
and fuel mix caps. Allow the engine to cool before storing.
ADJUSTING IDLE SPEED
See Figure 13.
■ If the engine starts, runs, and accelerates, but will not
idle, turn the idle speed screw “T” clockwise to increase
idle speed.
■ If the chain turns at idle, turn the idle speed screw “T”
counterclockwise to reduce the idle RPM and stop the
chainmovement. Ifthesaw chain stillmovesat idle speed,
contact an authorized service center for adjustment and
discontinue use until the repair is made.
WARNING
THESAWCHAINSHOULDNEVERTURNATIDLE.Turn
theidlespeedscrew“T”counterclockwisetoreducethe
idleRPM and stop the chain, or contact an authorized
servicecenterforadjustmentanddiscontinueuseuntil
the repair is made. Serious personal injury may result
from the saw chain turning at idle.
PULL AND PUSH
See Figure 14.
The reaction force of the saw is always opposite to the
direction the chain is moving. Thus, the operator must be
ready to control the PULL when cutting on the bottom edge
of the bar and the PUSH when cutting along the top edge.
NOTE: The chain saw has been fully factory tested. It is
normal to find some slight oil residue on the saw.
OPERATING THE CHAIN BRAKE(Fig. 4-5)
Check the operating condition of the chain brake prior to
each use.
■ Using the back of your left hand, engage the chain brake
by pushing the chain brake lever/hand guard toward the
bar while the chain is rotating rapidly.
■ Reset the chain brake back into the RUN position by
graspingthe top of the chain brakelever/hand guard and
pulling toward the front handle until you hear a click.
WARNING
Ifthechainbrakedoesnotstopthechainimmediately,
or if the chain brake will not stay in the run position
without assistance, take the saw to an authorized
service center for repair prior to use.
STARTING THE ENGINE
See Figures 6 - 10.
Thestartingmethoddiffersdependingonwhethertheengine
is cold or warm.
WARNING
Keep your body to the left of the chain line. Never
straddle the saw or chain, or lean over past the chain
line.
■ Place the chain saw on level ground and ensure that no
objects or obstructions are in the immediate vicinity that
couldcome in contact with the barand chain. To prevent
rapid dulling of the chain, do not allow the bar and chain
to contact dirt on the ground.
■Hold the front handle firmly with your left hand and put
your right foot onto the base of the rear handle.
To Start a Cold Engine:
■ Set the ignition switch to the RUN ( I ) position.
■ Makesurethechain brake is in the run positionbypulling
back on the lever/hand guard.
■ Fully press and release the primer bulb 4 times.
■ Pull choke knob all the way out to FULL CHOKE ( )
position.
■ Pull the starter grip until the engine attempts to start, but
no more than 5 times.
■ Push choke knob to HALF CHOKE ( ) position.
■ Pull starter grip until engine runs.
NOTE: Allow the saw to run in this position 15-30
seconds, depending upon the temperature.
■ Push the choke knob in to the RUN ( )position.
CAUTION
Failuretoreleasepartialthrottlewhenchainbrakelever
isinthebrakepositionwillresultinseriousdamageto
the unit. Never squeeze and hold the throttle trigger
while the chain brake is in the brake position.
OPERATION

8
manualor received adequate instructions for the safe and
proper use of this chain saw.
■ Keep everyone – helpers, bystanders, children, and
animals,a SAFE DISTANCE from the cutting area.During
felling operations, the safe distance should be a least
twice the height of the largest trees in the felling area.
During bucking operations, keep a minimum distance of
4.5 m between workers.
■ Alwayscut with both feetonsolidground to prevent being
pulled off balance.
■ Do not cut above chest height as a saw held higher is
difficult to control against kickback forces.
■ Do not fell trees near electrical wires or buildings. Leave
this operation for professionals.
■ Cut only when visibility and light are adequate for you to
see clearly.
BASIC OPERATING/CUTTING PROCEDURES
Practicecuttingafewsmalllogsusingthefollowingtechnique
to get the “feel” of using the saw before you begin a major
sawing operation.
■ Take the proper stance in front of the wood with the saw
idling.
■ Accelerate the engine to full throttle just before entering
the cut by squeezing the throttle trigger.
■ Begin cutting with the saw against the log.
■ Keep the engine at full throttle the entire time you are
cutting.
■ Allow the chain to cut for you; exert only light downward
pressure. Forcing the cut could result in damage to the
bar, chain, or engine.
■ Releasethethrottletrigger assoon asthecutiscompleted
allowingtheenginetoidle.Runningthesawatfullthrottle
without a cutting load can result in unnecessary wear to
the chain, bar, and engine.
■ Do not put pressure on the saw at the end of the cut.
FELLING TREES – HAZARDOUS
CONDITIONS
See Figure 20.
WARNING
Do not fell trees during periods of high wind or heavy
precipitation. Wait until the hazardous weather has
ended.
Whenfelling a tree, it is important that you heed the following
warnings to prevent possible serious injury.
■Wear eye, hearing, and head protection (A) when
operating this equipment.
OPERATION
KICKBACK PRECAUTIONS
See Figures 15 - 16.
WARNING
KICKBACK occurs when the moving chain contacts
an object at the upper portion of the tip of the guide
bar or when the wood closes in and pinches the
saw chain in the cut. Contact at the upper portion of
the tip of the guide bar can cause the chain to dig
into the object and stop the chain for an instant. The
result is a lightning-fast reverse reaction which kicks
the guide bar up and back toward the operator. If the
saw chain is pinched along the top of the guide bar,
the guide bar can be driven rapidly back toward the
operator. Either of these reactions can cause loss of
saw control, which can result in serious injury.
Do not rely exclusively upon the safety devices built
into the saw. As a chain saw user, you should take
steps to keep your cutting jobs free from accident or
injury. See General Safety Rules for more details.
PREPARING FOR CUTTING
PROPER GRIP ON HANDLES
See Figure 17.
WARNING
Never use a left-handed (cross-handed) grip or any
stance that would place your body or arm across the
chain line.
WARNING
DO NOT operate the throttle trigger with your left
hand and hold the front handle with your right hand.
Never allow any part of your body to be in the chain
line while operating a saw.
PROPER CUTTING STANCE
See Figure 18.
■ Balance your weight with both feet on solid ground.
■ Keep left arm with elbow locked in a “straight arm”
position to withstand any kickback force.
■ Keep your body to the left of the chain line.
■ Keep your thumb on underside of handlebar.
WORK AREA PRECAUTIONS
See Figure 19.
■ Cut only wood or materials made from wood; no sheet
metal, no plastics, no masonry, no non-wood building
materials.
■ Neverallow children to operate thesaw. Allow no person
to use this chain saw who has not read this operator’s

9
OPERATION
■Do not cut down trees having an extreme lean or large
trees with rotten or dead limbs, loose bark, or hollow
trunks. Have these trees pushed or dragged down with
heavy equipment, then cut them up.
■Consider the distribution and weight of heavy limbs (B).
■Clear out the undergrowth around the tree to be felled
(C).
■Do not cut trees near electrical wires or buildings (D).
■Consider the direction in which the tree leans (E).
■Check the tree for damaged or dead branches which
could fall and hit you during felling (F).
■Periodically glance at the top of the tree during the
back-cut to assure the tree is going to fall in the desired
direction.
■Keep all bystanders at a safe distance (G) (at least twice
the height of the tree).
■Prepare a path of safe retreat (H).
■Ifthetree starts to fall in thewrong direction, or if the saw
gets caught or hung up during the fall, leave the saw and
save yourself!
■Consider the wind direction before felling a tree.
■Do not fell trees near power lines or near buildings which
could be struck by falling limbs or the tree itself.
■The chainsaw operator should keep on the uphill side of
theterrain as the tree is likelyto roll or slide downhillafter
it is felled.
■Remove dirt, stones, loose bark, nails, staples, and wire
from the tree where felling cuts are to be made.
WARNING
Do NOT fell trees near power lines or near buildings
which could be struck by falling limbs or the tree
itself.
PROPER PROCEDURE FOR TREE FELLING
See Figure 21 - 24.
1. Pick your escape route (or routes in case the intended
route is blocked). Clear the immediate area around the
tree and make sure there are no obstructions in your
planned path of retreat. Clear the path of safe retreat
approximately 135° from the planned line of fall (A).
2. Consider the force and direction of the wind, the lean
and balance of the tree, and the location of large limbs.
These things influence the direction in which the tree will
fall. Do not try to fell a tree along a line different from its
natural line of fall (B).
3. Cut a notch about 1/3 the diameter of the trunk in the
sideofthe tree (C). Make thenotchcuts so they intersect
at right angles to the line of fall. This notch should be
cleaned out to leave a straight line.
To keep the weight of the wood off the saw, always make
the lower cut of the notch before the upper cut.
4. Make the back-cut (D) level and horizontal, and at a
minimum of 5 cm above the horizontal cut of the notch.
NOTE: Never cut through to the notch. Always leave
a band of wood between the notch and back cut
(approximately 5 cm or 1/10 the diameter of the tree).
This is called a “hinge” or “hingewood” (E).
It controls the fall of the tree and prevents slipping or
twisting or shoot-back of the tree off the stump.
On large diameter trees, stop the back cut before it is
deep enough for the tree to either fall or settle back on
thestump. Then insert soft wooden orplastic wedges (F)
intothecut so they do nottouchthe chain. Drive wedges
in, little by little, to help jack the tree over.
5. As tree starts to fall, stop the chainsaw and put it down
immediately. Retreat along the cleared path, but watch
the action in case something falls your way.
WARNING
Never cut through to the notch when making a back
cut. The hinge controls the fall of the tree: this is the
section of wood between the notch and back-cut.
REMOVING BUTTRESS ROOTS
See Figure 25.
Abuttressrootisalargerootextendingfromthetrunkofthe
tree above the ground. Remove large buttress roots prior
to felling. Make the horizontal cut (A) into the buttress first,
followed by the vertical cut (B). Remove the resulting loose
section(C)fromtheworkarea.Followthecorrecttreefelling
procedure after you have removed the large buttress roots.
Refer to “Operation – Proper Procedure for Tree Felling”
earlier in this manual.
BUCKING
See Figure 26.
Bucking is the term used for cutting a fallen tree to the
desired log length.
■Cut only one log at a time.
■Supportsmall logs on a sawing stand oranotherlogwhile
bucking.
■Keep a clear cutting area. Make sure that no objects can
contact the guide bar nose and chain during cutting: this
can cause kick-back (A).
■During bucking operations, stand on the uphill side so
that the cut-off section of the log cannot roll over you.
■Sometimes it is impossible to avoid pinching (with just
standard cutting techniques) or difficult to predict which
way a log will settle when cut.

10
OPERATION
BUCKING WITH A WEDGE
See Figure 27.
If the wood diameter is large enough for you to insert a soft
bucking wedge (B) without touching the chain, you should
use the wedge to hold the cut open to prevent pinching.
BUCKING LOGS UNDER STRESS
See Figure 28.
(C) LOG SUPPORTED AT ONE END.
(D) LOG SUPPORTED AT BOTH ENDS.
Make the first bucking cut (E) 1/3 of the way through the log
and finish with a 2/3 cut (F) on the opposite side.
Asyou cut the log,it will tend tobend. The saw can become
pinched or hung in the log if you make the first cut deeper
than 1/3 of the diameter of the log.
Givespecial attention to logs under stress(G) to prevent the
bar and chain from pinching.
OVERBUCKING
See Figure 29.
Begin on the top side of the log with the bottom of the saw
against the log; exert light pressure downward. Note that
the saw will tend to pull away from you.
UNDERBUCKING
See Figure 30.
Begin on the under side of the log with the top of the saw
against the log; exert light pressure upward.
During underbucking, the saw will tend to push back
at you. Be prepared for this reaction and hold the saw firmly
to maintain control.
LIMBING AND PRUNING
See Figure 31 - 32.
■Work slowly, keeping both hands on the saw with a firm
grip. Maintain secure footing and balance.
■Keep the tree between you and the chain while limbing.
Cut from the side of the tree opposite the branch you are
cutting.
■Do not cut from a ladder: this is extremely dangerous.
Leave this operation for professionals.
■Do not cut above chest height as a saw held higher is
difficult to control against kick-back.
WARNING
Never climb into a tree to limb or prune. Do not stand
on ladders, platforms, a log, or in any position which
may cause you to lose your balance or control of the
saw.
■When pruning trees it is important not to make the flush
cut next to the main limb or trunk until you have cut off
the limb further out to reduce the weight.
This prevents stripping the bark from the main member.
1. Underbuck the branch 1/3 through for your first cut
(A).
2. Overbuck the branch to drop it (B).
3. Finish by cutting smoothly and neatly against the
main member (C) so the bark will grow back to seal the
wound.
WARNING
If the limbs to be pruned are above chest height, hire
a professional to perform the pruning.
CUTTING SPRING POLES
See Figure 33.
Aspringpole(A)isanylog,branch,rootedstump, or sapling
whichis bent under tension byother wood so that it springs
back if the wood holding it is cut or removed. On a fallen
tree, a rooted stump has a high potential of springing back
to the upright position during the bucking cut to separate
the log from the stump.
Watch out for spring-poles; they are dangerous.
WARNING
Spring poles are dangerous and could strike the
operator causing the operator to lose control of the
chainsaw. This could result in severe or fatal injury to
the operator.

11
WARNING
Whenservicing,use onlyidentical Ryobi replacement
parts. Use of any other parts may create a hazard or
cause product damage.
WARNING
Always wear safety goggles or safety glasses with
side shields during power tool operation or when
blowing dust. If operation is dusty, also wear a dust
mask.
GENERAL MAINTENANCE
Avoid using solvents when cleaning plastic parts. Most
plastics are susceptible to damage from various types of
commercialsolventsandmaybedamagedbytheiruse.Use
clean cloths to remove dirt, dust, oil, grease, etc.
WARNING
Donotatanytime let brake fluids, petrol, petroleum-
basedproducts,penetratingoils,etc.,comeincontact
withplastic parts. Chemicalscandamage,weaken or
destroy plastic which may result in serious personal
injury.
LUBRICATION
All of the bearings in this tool are lubricated with a sufficient
amount of high grade lubricant for the life of the unit under
normaloperatingconditions.Therefore,nofurtherlubrication
is required.
REPLACING THE GUIDE BAR AND CHAIN
See Figures 34 - 43.
DANGER
Neverstart the engine before installing the guide bar,
chain, drivecase cover, and clutch drum. Without all
thesepartsinplace,the clutch can fly off or explode,
exposing the user to possible serious injury.
WARNING
Toavoidseriouspersonal injury,readandunderstand
all the safety instructions in this section.
■ Alwaysplace the switch in the STOP “ ” positionbefore
you work on the saw.
■ Make sure the chain brake is not set by pulling the chain
brake lever/hand guard towards the front handle to the
run position.
NOTE: Whenreplacingtheguide bar and chain, always use
the specified bar and chain.
■ Wear gloves when handling the chain and bar. These
components are sharp and may contain burrs.
■ Remove the bar mounting nuts using the combination
wrench provided.
■ Remove the clutch cover.
■ Remove the bar and chain from the mounting surface.
■ Remove the old chain from the bar.
■ Lay out the new saw chain in a loop and straighten any
kinks.The cutters (A) should face inthe direction of chain
rotation (B). If they face backwards, turn the loop over.
■ Place the chain drive links (C) into the bar groove (D) as
shown.
■ Position the chain so there is a loop at the back of the
bar.
■ Hold the chain in position on the bar and place the loop
around the sprocket (E).
■ Fit the bar flush against the mounting surface so that the
bar studs are in the long slot of the bar.
NOTE: Whenplacingthebar on the bar studs (F), ensure
that the adjusting pin (G) is in the chain tension pin hole
(H).
■ Replace the clutch cover (I) and bar mounting nuts (J).
■ Finger-tighten the bar mounting nuts. The bar must be
free to move for tension adjustment.
■ Remove all slack from the chain by turning the chain
tensioningscrew (K)clockwiseuntilthe chain seatssnugly
against the bar with the drive links in the bar groove.
■ Lift the tip of the guide bar up to check for sag.
■ Release the tip of the guide bar and turn the chain
tensioningscrew1/2turn clockwise. Repeat this process
until sag does not exist.
■ Hold the tip of the guide bar up and tighten the bar
mounting nuts securely.
The chain is correctly tensioned when there is no sag on
the underside of the guide bar, the chain is snug, but it can
be turned by hand without binding. Ensure that the chain
brake is not set.
NOTE: If chain is too tight, it will not rotate. Loosen the
bar nuts slightly and turn the tension adjuster 1/4 turn
counterclockwise. Lift the tip of the guide bar up and
retighten the bar nuts securely. Ensure that the chain will
rotate without binding.
MAINTENANCE

12
ADJUSTING THE CHAIN TENSION
See Figures 44 - 46.
WARNING
Never touch or adjust the chain while the motor is
running. The saw chain is very sharp. Always wear
protective gloves when performing maintenance on
the chain.
■ Stop the engine before setting the chain tension.
■ Make sure the bar mounting nuts are loosened to finger
tight.
■ Turn the chain tensioning screw clockwise to tension the
chain.
NOTE: A cold chain is correctly tensioned when there is
no slack on the underside of the guide bar, the chain is
snug, and it can be turned by hand without binding.
■ Retension the chain whenever the flats on the drive links
(A) hang out of the bar groove.
NOTE: During normal saw operation, the temperature
of the chain increases. The drive links of a correctly
tensioned warm chain will hang approximately 1.25 mm.
out of the bar groove. The tip of the combination wrench
can be used as a guide to help determine the correct
warm chain tension.
NOTE: New chains tend to stretch; check the chain
tension frequently and tension as required.
CAUTION
Achaintensioned while warm may betoo tight upon
cooling. Check the “cold tension” before next use.
CHAIN MAINTENANCE
See Figures 47 - 48.
CAUTION
Check that the switch is in the STOP “ ” position
before you work on the saw.
Use only a low-kickback chain on this saw. This fast-
cutting chain provides kickback reduction when properly
maintained.
For smooth and fast cutting, maintain the chain properly.
The chain requires sharpening when the wood chips are
small and powdery, the chain must be forced through the
wood during cutting, or the chain cuts to one side. During
maintenance of the chain, consider the following:
■ Improper filing angle of the side plate can increase the
risk of severe kickback.
■ Raker (depth gauge) clearance (A).
MAINTENANCE
• Too low increases the potential for kickback.
• Not low enough decreases cutting ability.
■ If the cutter teeth hit hard objects such as nails and
stones, or are abraded by mud or sand on the wood,
have an authorized service center sharpen the chain.
NOTE: Inspectthedrivesprocket(B) for wear or damage
when replacing the chain. If signs of wear or damage are
present in the areas indicated, have the drive sprocket
replaced by an authorized service center.
NOTE: If you do not fully understand the correct procedure
for sharpening the chain after reading the instructions that
follow, have the saw chain sharpened by an authorized
servicecenterorreplacewitharecommendedlow-kickback
chain.
SHARPENING THE CUTTERS
See Figures 49 - 52.
Parts of a cutter:
(A) Cutting corner (B) Side plate (C) Depth gauge
(D) Toe (E) Gullet (F) Heel
(G) Rivet hole (H) Top plate
Be careful to file all cutters to the specified angles and to
the same length, as fast cutting can only be obtained when
all cutters are uniform.
WARNING
The saw chain is very sharp. Always wear protective
gloves when performing maintenance to the chain
to prevent serious personal injury.
■ Tensionthechainprior to sharpening. Refer to Adjusting
The Chain Tension.
■ Use a 1.6 mm diameter round file and holder (not
provided). Do all of your filing at the midpoint of the
bar.
■ Keep the file level with the top plate of the tooth. Do not
let the file dip or rock.
■ Using light but firm pressure. Stroke towards the front
corner of the tooth.
■ Lift the file away from the steel on each return stroke.
■ Put a few firm strokes on every tooth. File all left hand
cutters (A) in one direction. Then move to the other
side and file the right hand cutters (B) in the opposite
direction.
■ Remove filings from the file with a wire brush.
CAUTION
A dull or improperly sharpened chain can cause
excessive engine speed during cutting, which may
result in severe engine damage.

13
WARNING
Improper chain sharpening increases the potential
of kickback.
WARNING
Failure to replace or repair a damaged chain can
cause serious injury.
TOP PLATE FILING ANGLE
See Figure 53.
(A) CORRECT 30° – file holders are marked with guide
marks to align file properly to produce correct top plate
angle.
(B) LESS THAN 30° – for cross cutting.
(C) MORE THAN 30° – feathered edge dulls quickly.
SIDE PLATE ANGLE
See Figure 54.
(D) CORRECT 80° – Produced automatically if you use the
correct diameter file in the file holder.
(E) HOOK – “Grabs” and dulls quickly; increases the
potential of KICKBACK. Results from using a file with a
diameter too small or a file held too low.
(F) BACKWARD SLOPE – Needs too much feed pressure;
causes excessive wear to the bar and chain. Results
from using a file with a diameter too large or file held
too high.
MAINTAINING DEPTH GAUGE CLEARANCE
See Figure 55 - 57.
■ Maintain the depth gauge at a clearance of 0.6 mm.
Use a depth gauge tool for checking the depth gauge
clearances (A).
■ Every time the chain is filed, check the depth gauge
clearance.
■ Use a flat file (B)(not provided) and a depth gauge jointer
(C)(not provided) to lower all gauges uniformly. Use a 0.6
mmdepth gaugejointer.Afterlowering eachdepthgauge,
restore original shape by rounding the front. Be careful
not to damage adjoining drive links with the edge of the
file.
■ Depth gauges must be adjusted with the flat file in the
same direction the adjoining cutter was filed with the
round file. Use care not to contact cutter face with flat
file when adjusting depth gauges.
MAINTAINING THE GUIDE BAR
See Figure 58.
MAINTENANCE
CAUTION
Make sure the chain has stopped before you do any
work on the saw.
Every week of use, reverse the guide bar on the saw to
distribute the wear for maximum bar life.The bar should
be cleaned every day of use and checked for wear and
damage.
Feathering or burring of the bar rails is a normal process
of bar wear. Such faults should be smoothed with a file as
soon as they occur.
A bar with any of the following faults should be replaced:
■ Wear inside the bar rails which permits the chain to lie
over sideways;
■ Bent guide bar;
■ Cracked or broken rails;
■ Spread rails.
In addition, lubricate guide bars (with a sprocket at their
tip) weekly. Using a grease syringe, lubricate weekly in
the lubricating hole. Turn the guide bar and check that
the lubrication holes (A) and chain groove are free from
impurities.
CAUTION
Makesure the air cleaner is correctly placed in the air
filter cover before reassembly. Never run the engine
without the air filter, serious damage could result.
CLEANING THE AIR CLEANER
See Figures 59 - 60.
ADJUSTING THE CARBURETOR
See Figures 61 - 63.
Before adjusting the carburetor:
■ Use a brush or compressed air to clean the starter cover
vents.
■ Clean the air cleaner (A). Refer to Cleaning the Air
Cleaner in the Maintenance section of this manual.
■ Allowthe engine to warm up prior to adjustment of engine
idle speed.
WARNING
Weather conditions and altitude may affect
carburetion. Do not allow bystanders close to the
chain saw while adjusting the carburetor.
IdleSpeedAdjustment—Theidlespeedadjustmentcontrols
how much the throttle valve stays open when the throttle
trigger is released. To adjust:
■ Turn idle speed screw “T” clockwise to increase idle
speed.
■ Turnidle speed screw “T” counterclockwise todecrease
idle speed.

14
MAINTENANCE
■ Makea test cut, thenadjust the H needle for best cutting
power,not for maximumspeed.The H needleisrestricted
to 1/4 turn.
WARNING
THE SAW CHAIN SHOULD NEVER TURN AT IDLE.
Seriouspersonal injury mayresultfrom the sawchain
turning at idle.
CLEANING THE STARTER UNIT
See Figure 62.
Useabrushorcompressedairtokeep the cooling vents (B)
of the starter assembly free and clean of debris.
CARBURETOR ANTI-FREEZE MECHANISM
See Figures 64 - 65.
The chain saw is designed with a ventilation hatch on the
right side of the cylinder cover which allows warm air to be
supplied from the engine to the carburetor to help prevent
icing under colder operating conditions. Operating the
chain saw in temperatures from 32ºF to 41ºF (0ºC to 5ºC)
attimesofhighhumiditymayresultiniceformingwithin the
carburetor. This can cause the output power of the engine
tobe reduced and/or the engine to fail to operate smoothly.
When operating under these circumstances, the chain saw
should be placed in anti-freeze mode before use.
To switch to anti-freeze mode:
■ Place the ignition switch in the OFF ( )position.
■ Remove the air cleaner cover (A).
■ Remove the air cleaner.
■ Lift choke knob (E) up to remove from the cylinder
cover (C).
■ Loosenthe fivescrewsholding thecylindercoverin place.
Remove the cylinder cover.
■ Remove the icing cap (D) located on the right-hand side
of the cylinder cover by pressing down on it with your
finger.
■ Adjust the icing cap so that the “snow” mark faces
upward,then return it to itsoriginalpositionin the cylinder
cover.
■ Replace the cylinder cover and reinstall screws to
secure.
■ Replace choke knob, air cleaner, and air cleaner cover.
WARNING
Always return the unit to normal operating mode
if there is no danger of icing occurring. Continuing
to use the chain saw in anti-freeze mode when
temperatureshaverisenandreturnedtonormalmay
result in the engine failing to start properly or in the
engine failing to operate at its normal speed.
CLEANING THE ENGINE
See Figures 66 - 67.
Clean the cylinder fins (B) and flywheel fins (A) with
compressed air or a brush periodically. Dangerous
overheating of the engine may occur due to impurities on
the cylinder.
WARNING
Never run the saw without all the parts, including
the drivecase cover and starter housing, securely in
place.
Because parts can fracture and pose a danger of
thrown objects, leave repairs of the flywheel and
clutch to factory trained authorized service center
personnel.
NOTE: If you notice a power loss with the gas-powered
tool, the exhaust port and muffler may be blocked with
carbon deposits. These deposits may need to be removed
to restore performance.
CHECKING THE FUEL FILTER
See Figure 68.
Checkthefuelfilter(B) periodically.Replaceitifcontaminated
or damaged.
REPLACING THE SPARK PLUG
See Figure 69.
This engine uses a Champion RZ7C or NGK CMR7H
spark plug with 0,64 mm electrode gap. Use an exact
replacementand replace every 50 hours ormorefrequently,
if necessary.
■ Loosenthe spark plug by turning it counterclockwise with
a wrench (A).
■ Remove the spark plug.
■ Hand thread the new spark plug, turning it clockwise.
Tighten securely with wrench (B).
NOTE: Be careful not to cross-thread the spark plug.
Cross-threading will seriously damage the cylinder.
INSPECTING/CLEANING THE SPARK
ARRESTOR SCREEN AND MUFFLER
EXHAUST PORT
See Figure 70.
Themufflerisequippedwithasparkarrestorscreen.Afaulty
sparkarrestorscreencancreateafirehazard.Throughnormal
use the screen can become dirty and should be inspected
weekly and cleaned as required. Always keep the muffler
and spark arrestor on the saw in good condition.
Thechainsawshouldalwaysbeusedwithcorrectlymounted
spiked bumper.
WARNING
Muffler surfaces are very hot during and after

15
MAINTENANCE
operationof the chain saw.Toavoidseriouspersonal
injury, keep all body parts away from the muffler.
■Allow the muffler to cool.
■ Remove torx screw (E) and 8 mm. nuts (D) holding the
mufflercover in place; remove muffler cover (C) andspark
screen (A).
■ If dirty, clean the spark arrestor screen with a small wire
brush. Replace the screen if it is cracked or otherwise
deteriorated.
■Remove the muffler (B).
■Insert a flat blade screwdriver into the muffler exhaust
vent to remove any carbon deposits.
■Wipe away any carbon buildup on the muffler exhaust
vent and the cylinder exhaust port at the same time.
■Reinstall muffler, spark screen, and muffler cover.
■Reinstall torx screw and nuts to secure.
INSPECTING AND CLEANING CHAIN BRAKE
See Figures 71 - 72.
■ Remove the clutch cover and clean the chain brake
components (A). Check wear on the brake band (C) and
replace if worn or deformed. The band thickness should
not be less than 0.6 mm, or worn halfway through.
■ Alwayskeep the chain brake mechanism clean and lightly
lubricate the linkage (B).
■ Alwaystest the chainbrakeperformanceafter servicing or
cleaning. Refer to Operating Chain Brake for additional
information.
■ Check the chain catcher (D) and replace if damaged.
WARNING
Even with daily cleaning of the mechanism, the
dependabilityofa chain brake to performunderfield
conditions cannot be certified. use proper cutting
techniques.
STORING THE CHAIN SAW (1 MONTH OR
LONGER)
■ Drain all fuel from tank into a container approved for
gasoline.
■ Run the engine until it stops. This will remove all fuel-oil
mix that could become stale and leave varnish and gum
in the fuel system.
■ Squeeze primer bulb several times to purge fuel from
carburetor.
■ Drain all bar and chain oil from tank into a container
approved for oil.
■ Clean all foreign material from the saw.
■ Store it in a well-ventilated place that is inaccessible to
children.
NOTE: Keepawayfrom corrosive agents such as garden
chemicals and de-icing salts.
Abide by local regulations for the safe storage and handling
ofpetrol. Excessfuelshouldbe usedinother2-cycle engine
powered equipment.

16
Problem Possible Cause Solution
Engine will not start.
[Make sure ignition
switch is in the RUN
( l ) position.]
No spark.
Engine is flooded.
Check spark. Remove air filter cover. Remove spark plug from
cylinder. Reattach the spark plug wire and lay spark plug on top
of cylinder with the metal part of plug touching the cylinder. Pull
the starter grip and watch for spark at spark plug tip. If there is no
spark, repeat test with a new spark plug.
With the ignition switch OFF, remove spark plug. Move choke
knob to RUN position (pushed in completely) and pull starter grip
15 to 20 times. This will clear excess fuel from engine. Clean and
reinstall spark plug. Set ignition switch to RUN ( l ) position. Push
and fully release primer bulb 4 times. Pull starter three times with
choke knob at RUN. If engine does not start, move choke knob to
HALF CHOKE and repeat normal starting procedure. If engine still
fails to start, repeat procedure with a new spark plug.
Engine starts but
will not accelerate
properly.
Carburetor requires “L”
(Low Jet) adjustment. Contact an authorized service center for carburetor adjustment.
Engine starts, then
dies. Carburetor requires “L” (Low Jet) adjustment. Contact an authorized service center for carburetor adjustment.
Engine starts but will
not run properly at
high speed.
Carburetor requires “H”
(High Jet) adjustment. Contact an authorized service center for carburetor adjustment.
Enginedoesnotreach
fullspeedand/oremits
excessive smoke.
Oil/fuel mixture incorrect.
Air filter is dirty.
Spark arrestor screen is
dirty.
Carburetor requires “H”
(High Jet) adjustment.
Use fresh fuel and the correct 2-stroke oil mix ratio.
Clean air filter. Refer to Cleaning the Air Cleaner in the
Maintenance section of this manual.
Clean spark arrestor screen. Refer to Cleaning the Spark
Arresting Screen in the Maintenance section of this manual.
Contact an authorized service center for carburetor adjustment.
Engine starts, runs,
and accelerates but
will not idle.
Chain turns at idle.
Carburetor requires
adjustment to idle speed.
Carburetor requires
adjustment to idle speed.
Air leak in the intake
system.
Turn idle speed screw “T” clockwise to increase idle speed.
Refer to Adjusting the Carburetor in the Maintenance section
of this manual.
Turn idle speed screw “T” counterclockwise to decrease speed.
Refer to Adjusting the Carburetor in the Maintenance section
of this manual.
Contact an authorized service center for a rebuild kit.
TROUBLESHOOTING