fiSparkplugloosefiCylinderheadinsufficientlytightenedfiCylinderorpistonwornfiNovalveclearancefiCrankshaftoilsealleakfiValvespringbrokenorweakfiValvenotseatingproperly(valvebent,worn,orfiPistonringworn,weak,broken,orstickingfiPistonringsideclearanceexcessivefiCylinderheadgasketdamagedfiCylinderheadwarpedfiCylindergasketdamagedfiEnginestopswitchturnedofffiSparkplugdirty,broken,orgapimproperlyad-fiSparkplugcaporhigh-tensionwiringdefectivefiSparkplugcapnotcontactingproperlyfiSparkplugtypeincorrectfiCrankshaftsensordefectivefiIgniterdefectivefiIgnitioncoildefectivefiEnginestopswitchwiringdefectivefiFlywheelmagnetodamagedfiWiringshortedorinterruptedfiIdleadjustingscrewimproperlyadjustedfiPilotjetorairpassagecloggedfiAircleanerelementclogged,poorlysealed,ornotfiSparkplugdirty,broken,orgapimproperlyad-fiSparkplugcaporhigh-tensionwiringdefectivefiSparkplugcapshortedornotcontactingproperlyfiSparkplugtypeincorrectfiIgniterdefectivefiIgnitioncoildefectivefiCrankshaftsensordefectivefiFlywheelmagnetodefectivefiWiringconnectornotingoodcontactSparkmissingorweak:justedFuel/airmixtureincorrect:installedCompressionlow:carbonaccumulationontheseatingsurface)Poorlow-speedperformance-Sparkweak:justedTROUBLESHOOTINGGUIDE103
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