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    Motor Noise

    Hey Folks I have 49 Hercules straight 6 with a Scripps drive. Motor starts and runs great! The boat is new to me. Up on plane at 2500 to 3000rpms it starts to make an ignition ping or motor knock/Rattle? It has 20hrs on Engine from a rebuild, crank rods etc in 2009, I have set the timing back...
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