67C3K11 9-6123456789Symptom 1: High engine idle speedLow compressionpressureValve clearance notadjusted correctly — Adjust the valveclearance.5-2Damaged cylinderhead gasket—Disassemble andcheck the cylinderhead and powerunit.5-295-42Damaged valveScratched piston orcylinderDamaged or wornpiston ringThrottle valve doesnot fully openThrottle control sys-tem malfunctionThrottle cable notadjusted correctlyCheck and adjustthe throttle cable.3-8Throttle link rod notadjusted correctlyCheck and adjustthe throttle link rod.3-8—Air leakage intointake manifold(carburetor to cylin-der head)Damaged gaskets,spacer, and intakemanifold (carbure-tor to cylinder head)Check the gaskets,spacer, and intakemanifold (carbure-tor to cylinderhead).4-12Symptom 2 Cause 1 Cause 2 Checking stepRefertopageEngine speed doesnot decrease whenthrottle control leveris in fully closedpositionCarburetor malfunc-tionCarburetors notsynchronizedSynchronize thecarburetors.4-17Throttle stop screwnot adjusted cor-rectlyAdjust the throttlestop screw.3-11Pilot screw notadjusted correctlyAdjust the pilotscrew.4-15Malfunction of thecarburetor internalpartsDisassemble andcheck the carbure-tor.4-12Throttle controllever does notreturn to fully closedpositionThrottle control sys-tem malfunctionThrottle cable notadjusted correctlyCheck and adjustthe throttle cable.3-8Throttle link rod notadjusted correctlyCheck and adjustthe throttle link rod.3-8Throttle cam notinstalled correctlyCheck the throttlecam.5-18Symptom 2 Cause 1 Cause 2 Checking stepRefertopageTroubleshooting the outboard motor
