Craftsman 247.203721 - Spark Plug Service

6.
Attachtheairfilter cover,makingsuretoalignplasticribfeaturesonthe
shroudto theplasticfeaturesontheairfilter cover.SeeFigure18.Turn
thumbscrewsclockwiseuntilsnug.Checkfor anymisalignment.
Air Filter
Cover
Plastic
Feature
Shroud
k,_ Feature
Figure18
SparkPlug Service
Toensureproperengineoperation,thesparkplugmustbeproperlygappedand
freeofdeposits.
I. Removethesparkplugbootandusea sparkplugwrenchtoremovethe
plug.SeeFigure19.
Spark Plug Boot
Spark Plug
Figure19
If the enginehasbeenrunning,the muffler will bevery hot.Becarefulnot
to touchthemuffler.
Measurethepluggapwith afeelergauge.Correctasnecessarybybending
sideelectrode.SeeFigure20.Thegapshouldbesetto 0.024-0.031in.
Electrode
Figure20
4. Checkthatthesparkplugwasherisingoodconditionandthreadthespark
pluginby handto preventcross-threading.
5. Afterthesparkplugisseated,tightenwith asparkplugwrenchto compress
thewasher.
flOrE:Wheninstallinga newsparkplug,tighten1/2turnafterthespark
plugseatstocompressthewasher.Whenreinstallinga usedsparkplug,
tighten1/8-1/4turn afterthesparkplugseatstocompressthewasher.
IMPORTANT:Thesparkplugmustbesecurelytightened.Animproperly
tightenedsparkplugcanbecomeveryhotandmaydamagetheengine.
Muffler
Temperatureof muffler and nearbyengineareasmayexceed150° F(65°C).
Avoidcontactwith theseareas.
Inspectmufflerperiodically,andreplaceif necessary.Replacementparts
forthe mufflermustbethesameandinstalledinthesamepositionasthe
originalparts.
CleanEngine
Dailyorbeforeeveryuse,cleangrass,chafforaccumulateddebrisfrom
engine.Keeplinkage,spring,andcontrolsclean.
Keepareaaroundandbehindmufflerfreeofanycombustibledebris.
Keepingenginecleanallowsairmovementaroundengine.
Enginepartsshouldbekeptcleantoreducetheriskofoverheatingand
ignitionofaccumulateddebris.
Donot usewater to cleanengineparts.Watercouldcontaminatefuel
system.Usea brushor drycloth.
CarburetorAdjustment
Thecarburetoronthisengineisnotadjustable.
2.
Visuallyinspectthesparkplug.Discardthesparkplugif thereisapparent
wear,orif theinsulatoriscrackedorchipped.Cleanthesparkplugwith a
wirebrushifit istobereused.
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