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1. Removethespark plug bootanduse a sparkplugwrenchto
removethe plug.See Figure17.
2. Visuallyinspectthe spark plug.Discardthe spark plug if thereis
apparentwear,or if the insulatoris crackedor chipped.Cleanthe
sparkplugwitha wirebrush if it is to be reused.
3. Measurethe plug gap with a feelergauge.Correctas necessary
by bendingsideelectrode.SeeFigure18.The gap shouldbeset
to 0.030in.
4. Checkthatthe sparkplug washeris in goodconditionandthread
the sparkplugin by handto preventcrossthreading.
5. After thesparkplugis seated,tightenwith a spark plugwrenchto
compressthe washer.
NOTE:Wheninstallinga newspark plug,tighten1/2turn after the
sparkplugseatsto compressthe washer.Whenreinstallinga used
sparkplug,tighten 1/8-1/4turnafterthe sparkplugseatsto compress
the washer.
Neverusegasolineorlow flashpointsolventsfor cleaningthe air
c eanereement. A f re orexpos on cou d resut.
Servicing the Air Cleaner
Theair cleanerpreventsdamagingdirt, dust,etc.,fromenteringthe
carburetorand beingforcedintothe engineand is importantto engine
life andperformance.Neverrunthe enginewithoutan air cleaner
completelyassembled.Checkthe aircleanerbeforeeach use.
Paperfilterscannotbe cleanedandmustbe replacedonce a year
orevery 100operatinghours;moreoftenif usedin extremelydusty
conditions.
1. Loosenscrewsthatholdthe airfiltercover.SeeFigure19.
2. Openthe coverand removethe pre-cleanerandairfilter.
3. Washthe pre-cleanerandallowto dry.
4. Discardold air filter.
5. Installnewairfilterandwashedpre-cleaner.
6. Closethe coverand tightenthe screws.
NOTE:If the filter is torn or damagedin anyway,replaceit.
Donot sprayenginewith waterto clean becausewatercould
contaminatefuel. Usinga gardenhoseor pressurewashingequip-
mentcanalso forcewater intothe muffleropening.Waterthat passes
throughthe mufflercanenterthe cylinder,causingdamage.
Accumulationof debrisaroundmufflercouldcausea fire.Inspectand
cleanbeforeevery use.
Cleaning the Engine
If theengine hasbeenrunning,allowit to coolfor at leasthalfan hour
beforecleaning.Periodicallyremovedirt build-upfrom theengine.
Cleanaroundthe muffler.Cleanwith a brushor compressedair.
Boot
Figure17
0.02-0.03 in.
===_1 _=====0.60=0.80 mm
Figure18
J
E
Air Filter
Cover
Figure19
Pre<leaner
J
18
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