Stihl 108 User Guide

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Circularsawblade 200
(chisel andscratcher tooth)
Fitthe appropriate stop
before mounting circularsawblade.
Fitting thestop seechapter Mounting
the Deflector.
30
Mounting circularsawblade
•Layyour brushcutter onitsback
with thegear head facing up.
• Position sawblade
(3)on
the thrust plate(4)-
teeth mustpointinclockwise
direction.
• Slipthethrust washer
(5)
andrider plate(6)over
the drive shaft
(7).
•Block thedrive shaft.
• Screw mounting nut
(8)counterclockwise onto
drive...

Fuel
Yourtwo-strokeenginerequires a
mixture ofbrand-name gasolineand
quality two-stroke engineoilwith the
classificationTe.
Useregular branded unleaded gasoline
with aminimum octanenumber of
90 ROZ (U.S.A./Canada: pumpoctane
min. 89!).
Iftheoctane number ofthe
regular gradegasoline
inyourarea is
lower
us5=lpremium unleaded fuel.
Fuel withalower octane number may
result
inpreignition (causingpinging)
which
isaccompanied byan increasein
engine temperature. This,inturn,
increases therisk ofthe piston...

FuelingFittingtheHarness
Beforefueling, cleanthefiller capand
the area around it
toensurethatnodirt
falls intothetank.
Always thoroughly shakethemixture in
the canister beforefueling yourmachi­
ne. Change
thefuel pick upbody every year.
Before storing yourmachine foralong
period, drainandclean thefuel tank and
run engine untilcarburetor is
dry.
Modelswithaloop handle comewithout
a harness (available asspecial acces­
sory forthese models).
Shoulder strap
Useofthe carrying strapisdescribed
in chapters...

Fullharness
• Putonthe fullharness (2).
• Adjust lengthuntilthespring
hook (3)rests against yourrighthip.
Use ofthe carrying strapisdescribed
inchapters SafetyPrecautions and
Selecting theCutting Tool. Balancing
thebrushcutter
• Attach thespring hook
(3)totheclamp(4)onthe drive shaft­
slacken thescrew (5).
• Slide theclamp upordown
the drive shaft.
•
Tightenthe screw moderately. •
Letgoofthe brush cutter andcheck
toseehowitisbalanced:
mowing heads,FixedLineHead
and
brush knifemust restlightly
onthe...

Starting
1
•Observe safetyprecautions -see
section SafetyPrecautionsinthis
manual.
• Hold down thethrottle trigger
interlock (1)and squeeze
the throttle trigger(2).
• Move theslide control (3)
toSTART position.
• Now release thethrottle trigger, slide
control andtrigger interlock
inthatorder=Thisisthe
starting-throttle position.
34
Ifengineiscold:
Setthechoke lever(4)to.L
Ifengineiswarm:
Set thechoke lever(4)to...
Also usethissetting ilengine hasbeen
running but
isstillcold. •
Puttheunit onthe ground:...

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2
•Pullthestarter gripslowly withyour
right hand untilyoufeel
itengage ­
and then give
itabrisk strong pull.
Do not pull outstarter ropemore
than 70cm (27)-
itmight break.
Do not letthe starter gripsnap
back -guide
itslowly intothe
housing sothat thestarter rope
can rewind properly. When
engine beginstofire:
Ifengine iscold:
Set choke lever(4)
to-
andcontinue cranking untilengine runs.
Ifengineiswarm:
Continue crankinguntilengine
runs_
Assoon aswarm engine runs:
• Blipthethrottle...

Toshutdown engine:
• Move slidecontrol (3)
toSTOP.
At very lowoutside temperatures:
Allow engine towarm up
As soon asengine runs:
• Blipthethrottle trigger-
the slide control
(3)moves tothe
run position
I,and theengine
returns toidling speed.
• Open throttle slightly -
warm upengine forshort period.
36
Ifthe engine doesnt start:
Ifyoudidnot move thechoke
lever
to.L
quickly enough aftertheengine
began tofire, thecombustion chamber
is flooded.
Remove sparkplugterminal
(5)-
• Unscrew anddryoffthe
spark...

AdjustingCarburetor
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Thecarburetor hasbeen adjusted for
optimum performance underthe
barometric pressureandclimatic
conditions atthe factory.
Basic setting
Thissettingisthestarting pointforfine
tuning andcanbeused asthe
standard setting.
•Check airfilter andclean it if
necessary.
• Carefully screwthehigh speed
adjusting screw(H) and lowspeed
adjusting screw(L)down ontotheir
seats (clockwise) andmake...

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Finetuning
•Mount thecutting tool.
Machines withcutting head:
•Trim linetocorrect length:
Lines mustextend asfar asline
limiting bladeonthe deflector
• Carry outthebasic setting.
• Warm upengine byrunning
itfor
about 1minute atfull throttle and
then return
toidlespeed.
• Back offhigh speed adjusting screw
(H)onehalfturn (counterclockwise).
• Runengine atfull throttle androtate
high speed adjusting screw
(H)...

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Adjustingidlespeed
Itisusually necessary tochange
the setting ofthe idle speed
adjusting screw
(LAorLD)after every
correction
tothe low speed
adjusting screw
(L).
Engine stopswhileidling
Turntheidle speed
adjusting screw
(LAorLD)
clockwise untilengine runs
smoothly -cutting
tool must notrotate.
Cutting toolrotates when
engine isidling
Turn theidle speed...