•Fueltankcapairventobstructed•Throttlebodyassyholderloose•Aircleanerductloose•FuelpumpdefectiveCompressionlow:•Sparkplugloose•Cylinderheadboltinsufficientlytightened•Cylinderboltloose•Cylinderorpistonworn•Novalveclearance•Valvespringbrokenorweak•Valvenotseatingproperly(valvebent,worn,orcarbonaccumulationontheseatingsurface)•Pistonringworn,weak,broken,orsticking•Pistonring/grooveclearanceexcessive•Cylinderheadgasketdamaged•Cylinderheadwarped•Cylindergasketdamaged•DecompressiontroubleOther:•ECUdefective•Brakedragging•Clutchslipping•Engineoverheating•Engineoilleveltoohigh•Engineoilviscositytoohigh•DrivechaintroublePoorornohigh-speedperformance-Firingincorrect:•Sparkplugdirty,broken,orgapimproperlyTROUBLESHOOTINGGUIDE187Compressionlow:•Sparkplugloose•Cylinderheadboltinsufficientlytightened•Cylinderboltloose•Cylinderorpistonworn•Novalveclearance•Crankshaftoilsealleak•Valvespringbrokenorweak•Valvenotseatingproperly(valvebent,worn,orcarbonaccumulationontheseatingsurface)•Pistonringworn,weak,broken,orsticking•Pistonring/grooveclearanceexcessive•Cylinderheadgasketdamaged•Cylinderheadwarped•Cylindergasketdamaged•DecompressiontroublePoorlow-speedperformance-Sparkweak:•Sparkplugdirty,broken,orgapimproperly•Sparkplugcaporhigh-tensionwiringdefective•Sparkplugcapshortedornotcontactingproperly•Sparkplugtypeincorrect•Crankshaftsensordefective•ECUdefective•Ignitioncoildefective•Alternatordefective•WiringconnectornotingoodcontactFuel/airmixtureincorrect:•Aircleanerelementclogged,poorlysealed,ornotinstalledj
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