Operator's Manual

ServicingtheSparkPlug
ServiceInterval:Every100hours—Checkthesparkplug.
Ensurethattheairgapbetweenthecenterelectrodeandthe
sideelectrodeiscorrectbeforeinstallingthesparkplug.Usea
spark-plugwrenchforremovingandinstallingthesparkplug
andagappingtool/feelergaugetocheckandadjusttheair
gap.Installanewsparkplugifnecessary.
Models68034and68035:UseaDENSOU16FSR-UBor
anNGKCR5HSBsparkplug.
Model68036:UseaDENSOW14EPR-UoranNGK
BP4ESsparkplug.
RemovingtheSparkPlug
1.Ensurethatthemachineisstoppedandthattheengine
isoff,andletthemachinecool.
2.Disconnectthewirefromthesparkplug(Figure23).
Figure23
1.Sparkplug
2.Wire
3.Cleanaroundthesparkplug.
4.Useaspark-plugwrenchtoremovethesparkplugand
themetalwasher.
CheckingtheSparkPlug
1.Lookatthecenterofthesparkplug(Figure24).Ifyou
seelightbrownorgrayontheinsulator,theengineis
operatingproperly.Ablackcoatingontheinsulator
usuallymeansthattheaircleanerisdirty.
Important:Donotcleanthesparkplug.Always
replacethesparkplugwhenithasablackcoating,
wornelectrodes,anoilylm,orcracks.
G02 3105
1 2 43 5
Figure24
1.Sideelectrode4.0.60to0.70mm(0.024to
0.028inch)gap(Models
68034and68035)
2.Centerelectrode5.0.70to0.80mm(0.028
to0.031inch)gap(Model
68036)
3.Insulator
2.Checkthegapbetweenthecenterandsideelectrodes
(Figure24).
3.Ifthegapisnotwithinthespeciedrange,dothe
following:
A.Ifthegapistoosmall,carefullybendtheside
electrodeawayfromthecenterelectrodeuntilthe
gapbetweentheelectrodesiscorrect.
B.Ifthegapistoolarge,carefullybendtheside
electrodetowardthecenterelectrodeuntilthegap
betweentheelectrodesiscorrect.
InstallingtheSparkPlug
1.Threadthesparkplugintothespark-plughole.
2.Tightenthesparkplugto20ft-lb(27N-m).
3.Connectthewiretothesparkplug.
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