Toro 74310 - Servicing the Spark Plugs

ServicingtheSparkPlugs
ServiceInterval:Every200hours—Checkandgapthe
sparkplug(EFIenginesonly).
Every500hours—Checkandgapthesparkplug
(Non-EFIenginesonly).
Makesurethattheairgapbetweenthecenterandside
electrodesiscorrectbeforeinstallingthesparkplugs.Usea
spark-plugwrenchforremovingandinstallingthesparkplugs
andagappingtool/feelergaugetocheckandadjusttheair
gap.Installnewsparkplugsifnecessary.
TypeforEFIengines:Champion
®
XC12YCorequivalent
TypeforNon-EFIengines:Champion
®
RC12YCor
equivalent
AirGap:0.76mm(0.030inch)
RemovingtheSparkPlugs
1.Movethespeedcontrollevertotheneutralposition
tostopthemachine.
2.DisengagethePTO,engagetheparkingbrake,stopthe
engine,andwaitforallmovingpartstostop.
3.Removethesparkplugs.
Figure36
CheckingtheSparkPlugs
Important:Replacethesparkplugswhentheyhave:a
blackcoating,wornelectrodes,anoilylm,cracksor
reuseisquestionable.
Ifyouseelightbrownorgrayontheinsulator,theengineis
operatingproperly.Ablackcoatingontheinsulatorusually
meansthattheaircleanerisdirty.
Setthegapto0.76mm(0.030inch).
G008794
1
2
Figure37
InstallingtheSparkPlugs
Tightenthesparkplugsto24.4to29.8N-m(18to22ft.-lb).
3
2
1
G015200
Figure38
33