Figure35
CheckingtheSparkPlug
Important:Donotcleanthesparkplug(s).Always
replacethesparkplug(s)whenithas:ablackcoating,
wornelectrodes,anoilylm,orcracks.
Note:Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingontheinsulator
usuallymeanstheaircleanerisdirty.
Setthegapto0.76mm(0.030inch).
Figure36
InstallingtheSparkPlug
Tightenthesparkplugto25to29N-m(18to22ft-lb).
Figure37
CleaningtheBlowerHousing
Toensurepropercooling,makesurethegrassscreen,cooling
ns,andotherexternalsurfacesoftheenginearekeptclean
atalltimes.
Annually,orevery100hoursofoperation(moreoften
underextremelydusty,dirtyconditions),removetheblower
housing,andanyothercoolingshrouds.Cleanthecooling
nsandexternalsurfacesasnecessary.Makesurethecooling
shroudsareinstalled.Torquetheblowerhousingscrewsto
7.5N-m(5.5ft-lb).
Important:Operatingtheenginewithablockedgrass
screen,dirtyorpluggedcoolingns,and/orcooling
shroudsremoved,willcauseenginedamagedueto
overheating.
32