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Checking Spark Plug
DO NOTcheckfor sparkwith spark plug removed.DO NOTcrank
enginewithsparkplugremoved.
Ifthe engine hasbeenrunning,the mufflerwill bevery hot. Be careful
notto touch the muffler.
NOTE: Checkthe sparkplug oncea seasonorevery25hoursof
operation.Changethe sparkplugoncea seasonor every100hours.
Toensureproperengine operation,the sparkplug mustbe properly
gappedandfreeof deposits.
1. Removethespark plug bootanduse a sparkplug wrenchto
removethe plug.See Figure13.
2. Visuallyinspectthe sparkplug.Discardthe sparkplugif thereis
apparentwear,or if the insulatoris crackedor chipped.Cleanthe
sparkplugwitha wirebrush if it is to be reused.
3. Measurethe pluggapwitha feelergauge.Correctas necessary
by bendingsideelectrode.See Figure14.The gapshouldbe set
to .02-.03inches(0.60-0.80ram).
4. Checkthatthe sparkplug washeris ingoodconditionandthread
the sparkplug in by handto preventcross-threading.
5. Afterthespark plug is seated,tightenwitha sparkplugwrenchto
compressthe washer.
NOTE:Wheninstallinga newsparkplug,tighten1/2-turnafterthe
sparkplugseatsto compressthe washer.Whenreinstallinga used
sparkplug,tighten 1/8-to 1/4-turnafter the sparkplug seatsto
compressthe washer.
The sparkplug mustbe tightenedsecurely.A loosesparkplug can
becomevet hotand can dama ethe enine.
Spark Rug
SparkPlug Boot
Figure13
Electrode
Figure14
17
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