Manual

Maintenance
(ECXHNBBC21and
ECXHN21Units).(May
needmoreofteniftheyare
damagedorexcessively
dirty.)
Note:DoNotoperatetheenginewithouttheair
cleanerassembly;extremeenginedamagewilloccur.
1.Stoptheengineandwaitforallmovingpartsto
stop.
2.Disconnectthewirefromthesparkplug
(
Figure9).
3.Removethetwowingnutsthatsecurethecover
(
Figure27).
Figure27
1.Wingnuts4.Foamelement
2.Cover
5.Base
3.Paperelement
4.Removethecover.
Note:Becarefultopreventdirtanddebrisfrom
fallingintothebase.
5.Removethefoamandpaperelementsfromthe
base.
6.Removethefoamelementfromthepaper
element.
7.Inspectthefoamandpaperelements,andreplace
themiftheyaredamagedorexcessivelydirty.
8.Tapthepaperelementonahardsurfaceseveral
timesorusecompressedairnotexceeding30
psi(207kPa)throughthelterfromthewire
screensidetoremoveanyexcessdirt.Ifthepaper
elementisexcessivelydirty,replaceit.
Note:Nevertrytobrushdirtoffthepaper
element;brushingforcesthedirtintothebers.
9.Cleanthefoamelementinwarm,soapywateror
inanonammablesolvent.
10.Rinseanddrythefoamelementthoroughly.
11.Dipthefoamelementincleanengineoil,then
squeezeouttheexcessoil.
Note:Excessoilinthefoamelementrestricts
theairowthroughtheelementandmayreach
thepaperlterandclogit.
12.Wipedirtfromthebaseandthecoverwitha
moistrag.
Note:Becarefultopreventdirtanddebrisfrom
enteringtheairductleadingtothecarburetor.
13.Installtheaircleanerelementsandensurethat
theyareproperlypositioned.
14.Securelyinstallthecoverwiththetwowingnuts.
ChangeEngineOil
ServiceInterval:Aftertherst5hours
Every50hours(Mayneed
moreoftenundersevere
conditions.)
1.Runtheenginetowarmtheengineoil.
Note:Warmoilowsbetterandcarriesmore
contaminates.
WARNING
Oilmaybehotafterenginehasbeenrun.
Contactwithhotoilcancauseseverepersonal
injury.
Avoidcontactingthehotengineoilwhenyou
drainit.
2.Stopengine,waitforallmovingpartstostop.
3.Disconnectthewirefromthesparkplug.
4.Drainthegasolinefromthefueltank.Referto
EmptyingtheFuelTankandCleaningthe
FuelFiltersection.
26