Compressionlow:●Sparkplugloose●Cylinderheadinsufficientlytightened●Cylinderboltloose●Cylinderorpistonworn●Novalveclearance●Valvespringbrokenorweak●Valvenotseatingproperly(valvebent,worn,orcarbonaccumulationontheseatingsurface)●Pistonringworn,weak,broken,orsticking●Pistonring/grooveclearanceexcessive●Cylinderheadgasketdamaged●Cylinderheadwarped●Cylinderbasegasketdamaged●DecompressiontroubleImproperacceleration:●Throttlevalvedoesnotfullyopen●Aircleanerelementclogged●Fuelcontaminatedwithwaterorforeignmatter●Brakedragging●Clutchslipping●Engineoverheating●Engineoilleveltoohigh●Engineoilviscositytoohigh●Crankshaftbearingwornordamaged●DrivechaintroubleKnocking:●Carbonbuiltupincombustionchamber●Fuelqualitypoorortypeincorrect●Sparkplugtypeincorrect●ECUdefectiveEngineoverheating-Firingincorrect:●Sparkplugdirty,broken,orgapimproperly●Sparkplugtypeincorrect●ECUdefectiveFuel/airmixtureincorrect:●Throttlebodyassyholderloose●Aircleanerelementclogged,poorlysealed,ornotinstalled●AircleanerductpoorlysealedCompressionhigh:●CarbonbuiltupincombustionchamberEngineoverloaded:●Brakedragging●Clutchslipping●Engineoilleveltoohigh●Engineoilviscositytoohigh●DrivechaintroubleLubricationinadequate:●Engineoilleveltoolow●EngineoilqualitypoorortypeincorrectCoolantinadequate:●Coolantleveltoolow●CoolantdeterioratedTROUBLESHOOTINGGUIDE187
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