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A 2005 Yamaha 9.9 High Thrust outboard engine on a 42-foot catamaran suffers from persistent starting difficulties, engine cut-outs at low revolutions, and recurring starter solenoid failures.1:51 After testing the starter, compression, and charging circuit, the ignition system remains the primary suspect for the weak, inconsistent spark.12:26 Replacing the coil pack fails to resolve the issue, but installing a new CDI unit restores reliable starting and consistent ignition.18:29 The crew identifies a potential cause for the blown solenoids as voltage spikes originating from the faulty CDI unit.21:18 Further adjustments include setting the carburetor idle mixture to a base of one and a half turns out from the bottomed position and reconfiguring the fuel pump backing plate to maintain proper telltale routing.19:55 The engine now functions as intended, though the carburetor requires a full teardown to finalize the fuel mixture.21:41

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