Exmark QUEST - Servicing the Spark Plug

Maintenance
andretainthehose.Wipeupanyexcessoilon
theframe(Figure25).
Note:Disposeoftheusedoilatarecycling
center.
10.ApplyathinlmofcleanExmark4-Cycle
PremiumEngineOiltotherubbergasketonthe
newlter.
11.Installthereplacementoilltertothemounting
pad.Turntheoillterclockwiseuntiltherubber
gasketcontactsthepad,thentightenthelteran
additional1/2to3/4turn.
12.Slowlypourapproximately80%ofthespecied
oilintothellertube—useoilrecommendedin
theCheckingtheOilLevelsection.
13.Installtheoilllcap/dipstickandpushintoplace,
butDoNotscrewitin.
14.Checktheoillevel(
Figure24);refertoChecking
theOilLevelsection.
15.Slowlyaddadditionaloiltobringittothefull
mark.DoNotoverll.
16.Installtheoilllcap/dipstick.
17.Starttheengineandcheckforleaks.
ServicingtheSparkPlug
ServiceInterval:Every200hours/Every2
years(whichevercomes
rst)
Every500hours—Replace
thesparkplug.
Asstatedinthemaintenanceintervals,removethe
sparkplug,checkcondition,andresetthegapor
replacewithanewplugasnecessary.
ThesparkplugisRFIcompliant.Equivalentalternate
brandplugscanalsobeused.
Type:NGKBPR4ES(orequivalent)
AirGap:0.030inch(0.76mm)
RemovingtheSparkPlug
1.Disengagethebladecontrolswitch,movethe
motioncontrolsoutwardtotheparkposition,
stoptheengine,andremovethekey.
2.Pullthewireoffofthesparkplug(Figure26).
Cleanaroundthesparkplugtopreventdirtfrom
fallingintotheengineandpotentiallycausing
damage.
Note:Duetothedeeprecessaroundthespark
plug,blowingoutthecavitywithcompressedair
isusuallythemosteffectivemethodforcleaning.
Thesparkplugismostaccessiblewhentheblower
housingisremovedforcleaning.
3.Removethesparkplugandmetalwasher.
Figure26
1.Sparkplugandwirelocation
CheckingtheSparkPlug
1.Lookatthecenterofthesparkplug(Figure27).
Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingon
theinsulatorusuallymeanstheaircleanerisdirty.
Important:Nevercleanthesparkplug.
Alwaysreplacethesparkplugwhenithasa
blackcoating,wornelectrodes,anoilylm,
orcracks.
2.Checkthegapbetweenthecenterandside
electrodes(
Figure27).Bendthesideelectrodeif
thegapisnotcorrect.
Figure27
1.Sideelectrode3.Airgap(nottoscale)
2.Centerelectrode
insulator
InstallingtheSparkPlug
1.Installthesparkplug.Makesurethattheairgap
issetcorrectly.
2.Tightenthesparkplugto16ft-lb(22N-m).
3.Pushthewireontothesparkplug(
Figure26).
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