TRBLSHTG Troubleshooting9-11 69J1D11Symptom: The engine idle speed is not steady, but increases or decreases.• Check the intake manifold.• Check the air intake system.• Check the ignition system.Out ofspecification?Are the throt-tle valvessynchronize?Check the second-ary air intake on theO-ring and manifoldplate, idle speedcontrol hose, andthe gaskets of thevacuum check bolts.Check the ignition timing.YesYesNoNoCheck the operation of thethrottle cable and throttle link.YesNo Adjust the throttle cable andthrottle link.Good operat-ing condition?Check the synchronization ofthe throttle valve.Check the engine using theYamaha Diagnostic System.Synchronize the throttle valves.
