69J3D11 9-54123456789Symptom: Engine does not accelerate when the throttle is opened quickly.The engine turns off when the throttle is opened quickly.Acceleration is tardy and the engine is likely to stop at any moment.• Check the engine using the diagnostic flash indicator or the Yamaha Diagnostic System.Symptom: Engine can run, but engine speed will not increase.Overheat warning indicator is on.Oil pressure warning indicator is on.Warning indicator is on and buzzer is sounding.• Check the cooling system.• Check the lubrication system.Cooling systemCheck the cooling water inlet forclogs or debris.Check that cooling water isdischarged from the coolingwater pilot hole.Replace the thermostat.Check the waterpump impeller.Check the waterpassage.Clogs or debris?Is waterdischarged?Clean the cooling water inlet.YesNoNoYesYesYesNoNoCheck the thermostat operation.Replace theimpeller.NoYesCheck the engine temperaturesensor and thermoswitch.Check the engine using theYamaha Diagnostic System.Replace the engine tempera-ture sensor or thermoswitch.Good condition?Good condition?Good condition?Power unit
