Specifications

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
g027479
Figure34
InstallingtheSparkPlug
Tightenthesparkplugto20N-m(15ft-lb).
B
A
15 ft-lb
20 N-m
g027480
C
D
Figure35
CleaningtheBlowerHousing
Toensurepropercooling,makesurethegrassscreen,cooling
ns,andotherexternalsurfacesoftheenginearekeptclean
atalltimes.
Annuallyorevery100hoursofoperation(moreoftenunder
extremelydusty,dirtyconditions),removetheblowerhousing
andanyothercoolingshrouds.Cleanthecoolingnsand
externalsurfacesasnecessary.Makesurethecoolingshrouds
areinstalledafternishingthemaintenance.Torquethe
blower-housingscrewsto7.5N-m(5.5ft-lb).
Important:Operatingtheenginewithablockedgrass
screen,dirtyorpluggedcoolingns,and/orcooling
shroudsremoved,willcauseenginedamagedueto
overheating.
33