Operation Manual

CheckingtheSparkPlug
Important:Donotcleanthesparkplug(s).Always
replacethesparkplug(s)whenithas:ablackcoating,
wornelectrodes,anoilylm,orcracks.
Note:Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingontheinsulator
usuallymeanstheaircleanerisdirty.
Setthegapto0.76mm(0.030inch).
B
A
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Figure39
InstallingtheSparkPlug
Tightenthesparkplugto20N•m(15ft-lb).
Figure40
CleaningtheBlowerHousing
Toensurepropercooling,makesurethegrassscreen,cooling
ns,andotherexternalsurfacesoftheenginearekeptclean
atalltimes.
Annuallyorevery100hoursofoperation(moreoftenunder
extremelydusty,dirtyconditions),removetheblowerhousing
andanyothercoolingshrouds.Cleanthecoolingnsand
externalsurfacesasnecessary.Ensurethatthecooling
shroudsareinstalledafternishingthemaintenance.Torque
theblower-housingscrewsto7.5N•m(5.5ft-lb).
Important:Operatingtheenginewithablockedgrass
screen,dirtyorpluggedcoolingns,and/orcooling
shroudsremoved,willcauseenginedamagedueto
overheating.
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