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Yoshm0-

I mounted my Humminbird transducer last year to the same boat (Montauk 17) with the same engine in the same exact spot you are thinking of putting it, except mine was on the starboard side. It wouldn't work at all once I pushed the throttle a bit.

Then I took the transducer off that location and put it in the exact same spot Tom is now recommending on the port side. It works very well at full-throttle with the exception of some engine cavitation interference occasionally (I think I need a new propeller).

I used the stern saver to avoid drilling holes intro my transom. www.sternsaver.com. Make sure that when you mount that transducer that the bottom side is level with the hull of the boat. You want the bottom to skim the water as opposed to plowing through it with the front of it. Originally I mounted the transducer so that it was plowing through the water and it would immediately turn off when I increased throttle.