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<blockquote data-quote="JL8Jeff" data-source="post: 484359" data-attributes="member: 12995">The shaft length on the motor and the transom height will determine the mounting position and whether it needs a transom extension or riser.&nbsp; The front foot of the jet needs to sit almost level with the bottom of the boat.&nbsp; A short shaft motor is 15&quot; in length, the long shaft is 20&quot; I believe and the newer long shafts might be 25&quot;.&nbsp; So if you get the wrong shaft length, the motor might need to sit 5&quot; higher on the transom.&nbsp; What is the transom height on the specific boat you are looking at?Here is a picture of the Mercury short shaft jet (15&quot;) on my Lowe which is a tunnel jet hull.&nbsp; You can see that the motor is mounted almost 2-1/2&quot; above the transom to get the foot just under the top of the tunnel.&nbsp; I think I tried 3 or 4 mounting positions before I found the optimum spot (least amount of spray back and best performance without aerating the jet).</blockquote>

[QUOTE="JL8Jeff, post: 484359, member: 12995"] The shaft length on the motor and the transom height will determine the mounting position and whether it needs a transom extension or riser. The front foot of the jet needs to sit almost level with the bottom of the boat. A short shaft motor is 15" in length, the long shaft is 20" I believe and the newer long shafts might be 25". So if you get the wrong shaft length, the motor might need to sit 5" higher on the transom. What is the transom height on the specific boat you are looking at? Here is a picture of the Mercury short shaft jet (15") on my Lowe which is a tunnel jet hull. You can see that the motor is mounted almost 2-1/2" above the transom to get the foot just under the top of the tunnel. I think I tried 3 or 4 mounting positions before I found the optimum spot (least amount of spray back and best performance without aerating the jet). [/QUOTE]

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