Operator's Manual

ServicingtheSparkPlug
ServiceInterval:Every100hours—Inspect,clean,
andadjustthesparkpluggap;
replacethesparkplugifnecessary.
UseanNGKBPR5ESsparkplugorequivalent.
1.Shutofftheengineandwaitforallmovingparts
tostop.
2.Disconnectthewirefromthesparkplug.
3.Cleanaroundthesparkplug.
4.Removethesparkplugfromthecylinderhead.
Important:Replaceacracked,fouled,or
dirtysparkplug.Donotcleantheelectrodes
becausegritenteringthecylindercan
damagetheengine.
5.Setthegapontheplugto0.76mm(0.030inch);
refertoFigure24.
g000533
Figure24
1.Center-electrodeinsulator
2.Sideelectrode
3.Airgap(nottoscale)
6.Carefullyinstallthesparkplugbyhand(toavoid
crossthreading)untilitishandtight.
7.Tightenthesparkplugto23N∙m(2.3kgf-m,17
ft-lb).
Important:Aloosesparkplugcanbecome
veryhotandcandamagetheengine;
overtighteningasparkplugmaydamagethe
threadsinthecylinderhead.
8.Connectthewiretothesparkplug.
DriveSystem
Maintenance
AdjustingtheSelf-Propel
Drive
Ifthemachineisnew,doesnotself-propel,orittends
tocreepforward,adjustthedrivecable.
1.Movethemachineoutsideandontoapaved
surfacenearasolidwalltosafelypreventthe
machinefrommovingforwardwhiletheengine
isrunning.
2.Positionthemachinewiththefronttiresagainst
thewall.
Note:Ensurethattheareaiswellventilated
andclearofdebristhatcouldbethrownbythe
machine.
3.Shiftthetransmissiontothirdgear.
4.Starttheengine;refertoStartingtheEngine
(page13).
5.Pulltheself-propel-drivebartothehandle.
Note:Thewheelsshouldstarttoturnasthe
self-propel-drivebarjusttouchesthehandle.
6.Shutofftheengine.
7.Ifyoumustadjustthemachine,dothefollowing:
•Ifthewheelsdonotspinwhenyouengage
theself-propel-drivebar,thetractionbeltis
tooloose.Rotatethewheel-drive-control
knob(Figure25)clockwise1turnandrepeat
steps4through6.
g024468
Figure25
1.Wheel-drive-controlknob
•Ifthewheelsspinbeforeyoufullyengage
theself-propel-drivebar,thetractionbelt
istootight.Rotatethewheel-drive-control
knob(Figure25)counterclockwise1turn
andrepeatsteps4through6.
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