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    Yamaha 200 HPDI new impellor hum noise

    Just had a new impeller put in Yamaha 2004 200 HPDI . When at idle and not in gear I get a strange hum hum hum background noise, no grinding at all, smooth alternating hum. See video. Water pees great, when in gear noise goes away. Motor runs great at full power and cool but when put back in...
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