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Removethespark plug bootand use a sparkplug wrenchto
removethe plug.See Figure20.
Spark Plug
Figure20
2.
Visuallyinspectthe spark plug.Discardthe spark plug if thereis
apparentwear,or if the insulatoris crackedor chipped.Cleanthe
sparkplug with a wirebrush if it is to be reused.
3.
Measurethe plug gap with a feelergauge.Correctas necessary
by bendingsideelectrode.See Figure21.The gap shouldbe set
to 0.030in.
Figure21
4.
Checkthatthe sparkplug washeris in good conditionand thread
the sparkplug in by handto preventcross-threading.
5.
After thespark plug isseated,tightenwith a spark plugwrenchto
compressthe washer.
NOTE:Wheninstalling a newsparkplug,tighten1/2turnafterthe spark
plugseatstocompressthewasher.Whenreinstalling a usedsparkplug,
tighten1/8-1/4 turnafterthespark plugseatsto compress thewasher.
The sparkplug mustbe securelytightened.An improperly tightened
spark plugcan becomevery hot and maydamagethe engine.
Servicing
the Air Cleaner
Neverusegasolineor lowflash point solventsfor cleaningtheair
cleanerelement.A fireor explosioncould result.
The air cleanerpreventsdamagingdirt, dust,etc., from enteringthe
carburetorand being forcedintothe engineand is importantto engine
lifeand performance.Neverrunthe enginewithoutan air cleaner
completelyassembled.Checkthe air cleanerbeforeeachuse.
Paperfilterscannot be cleanedand mustbe replacedoncea year
or every 100operatinghours;moreoften if usedin extremelydusty
conditions.
1.
Removethe screwsthat hold theair filter cover.See Figure22.
Air Filter
Cover
Air Filter &
Pre=Cleaner
Screws
Figure22
2.
Openthe coverand removethe pre-cleanerand air filter.
3.
Washthe pre-cleanerand allowto dry.
4.
Discardold air filter.
5.
installnewair filter and washedpre-cleaner.
6.
Closethe coverand tightenthe screws.
NOTE:If the filter is tornor damagedin any way,replaceit.
Cleaning
the Engine
Do notsprayengine with waterto cleanbecausewater could
contaminatefuel. Usinga gardenhoseor pressurewashingequip-
mentcan alsoforce waterintothe muffleropening.Waterthat passes
throughthe mufflercan enterthe cylinder,causingdamage.
Accumulationof debrisaround mufflercouldcausea fire. inspectand
clean beforeevery use.
If the enginehas been running,allow it to coolfor at leasthalf an hour
beforecleaning.Periodically removedirt build-upfrom the engine.
Cleanaroundthe muffler.Cleanwith a brushor compressed air.
8
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