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  1. C

    Johnson 2001 9.9HP makes loud whistling

    Our new Johnson 9.9 HP makes a loud whistling sound at half throttle or higher. Any ideas? The motor is mounted in the well of a 25 Foot sailboat.<br /><br />------------------
  2. C

    Whistling sound, 2001 Johnson 9.9HP

    Loud Whistling sound at greater than half-throttle.
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