if your humminbird transducer is like the one I just added a little while ago make sure you installled the rubber plug that comes with it that fills the space between the transducer and the transom in between the mounting bracket. I forgot to put it in and got huge rooster tail.
edit: just did a little research and found that maybe not all the humminbird transducers were shipped with the rubber plug (comes with "high speed" transducers apparently) A work around is wrap some electrical tape around the opening.
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1986 V-20
1986 Yamaha 150 HP
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