what you probably have is a slightly bent prop.....the prop on an alpha 1 drive will have a slight amount of play.......once you get the boat out of the water.....lower the drive....get a screw drive and clamp it to a jack stand or something stable and point it at one of the blades...don't touch it ..just get it really close...turn the prop by hand....watch the other props as you spin it......if one is out of true...it will cause the vibration.....hope this helps....
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SSN683 Association member
Par Excellence
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2008 Bayliner 340 - "Wild Whim"
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Anyone that sez "Size doesn't matter" has never owned a boat!
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