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Jet Boats
General Jet Boat Discussions
Jet/transom angle
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<blockquote data-quote="JL8Jeff" data-source="post: 477792" data-attributes="member: 12995"><p>I don't know if you can run the wedges with the riser plates so you may want to try one change at a time to see how it affects performance. If you remove the wedges and leave the motor at the current height, you may get porpoising at higher speeds which would mean you need the wedges even if you raise the motor with the riser plates. What length shaft is the motor? You might have a longshaft (20") and need a shortshaft (15") motor to be able to keep the motor installed lower on the transom. My motor is a shortshaft and even with that, it's sitting 2 to 2-1/2" above the transom to get the foot tucked in to the top of the tunnel. My boat would porpoise with the prop outboard that was on it when I got it and then it also would porpoise with the shortshaft jet. It took the wedges to get rid of the porpoising so you may run into the same situation. I think that has more to do with the weight distribution and transom angle.</p></blockquote><p></p>
[QUOTE="JL8Jeff, post: 477792, member: 12995"] I don't know if you can run the wedges with the riser plates so you may want to try one change at a time to see how it affects performance. If you remove the wedges and leave the motor at the current height, you may get porpoising at higher speeds which would mean you need the wedges even if you raise the motor with the riser plates. What length shaft is the motor? You might have a longshaft (20") and need a shortshaft (15") motor to be able to keep the motor installed lower on the transom. My motor is a shortshaft and even with that, it's sitting 2 to 2-1/2" above the transom to get the foot tucked in to the top of the tunnel. My boat would porpoise with the prop outboard that was on it when I got it and then it also would porpoise with the shortshaft jet. It took the wedges to get rid of the porpoising so you may run into the same situation. I think that has more to do with the weight distribution and transom angle. [/QUOTE]
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Jet/transom angle
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