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Removethespark plug bootanduse a sparkplug wrenchto
removethe plug.See Figure21.
Figure21
Visuallyinspectthe spark plug.Discardthe spark plug if thereis
apparentwear,orif the insulatoris crackedor chipped.Cleanthe
sparkplugwitha wirebrush if it is to be reused.
Measurethe pluggapwitha feelergauge.Correctas necessary
by bendingsideelectrode.SeeFigure18.The gapshouldbeset
to 0.030in.
Servicing the Air Cleaner
Neverusegasolineor lowflashpoint solventsfor cleaningtheair
cleanerelement.A fireor explosioncould result.
The air cleanerpreventsdamagingdirt, dust,etc.,fromenteringthe
carburetorandbeing forcedintothe engineand is importantto engine
lifeand performance.Neverrunthe enginewithoutanair cleaner
completelyassembled.Checkthe air cleanerbeforeeachuse.
Paperfilterscannotbecleanedand mustbe replacedoncea year
or every100operatinghours;moreoftenif usedinextremelydusty
conditions.
1. Pressthetab on the air filtercover,lift the coverand removethe
air filter.See Figure23.
..........
Air Filter
Cover
Filter
Figure22
4. Checkthatthe sparkplugwasheris in good conditionand thread
the sparkplug in by handto preventcross-threading.
5. After thesparkplugis seated,tightenwith a spark plugwrenchto
compressthe washer.
NOTE:Wheninstallinga newsparkplug,tighten1/2turnafterthe spark
plugseatstocompressthewasher.Whenreinstallinga usedsparkplug,
tighten1/8-1/4turnafterthesparkplugseatsto compressthewasher.
The sparkplug mustbe securelytightened.An improperlytightened
sparkplugcan becomevery hot andmaydamagethe engine.
Figure23
2. Discardoldair filter.
3. Installnewair filter.
4. Closethe cover.
NOTE:If the filteris tornor damagedinany way,replaceit.
Cleaning the Engine
Do notsprayenginewithwaterto cleanbecausewatercould
contaminatefuel.Usinga gardenhoseor pressurewashingequip-
mentcan alsoforcewaterintothe muffleropening.Waterthatpasses
throughthe mufflercan enterthe cylinder,causingdamage.
Accumulationof debrisaroundmufflercouldcausea fire. Inspectand
clean beforeevery use.
Ifthe enginehas beenrunning,allow it to coolfor at leasthalf an hour
beforecleaning.Periodicallyremovedirt build-upfromthe engine.
Cleanaroundthe muffler.Cleanwitha brushor compressedair.
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