Transom plate reseal

[K447]

… 2021 GP1800R svho built in October.

I took off transom to reseal. The factory transom silicone was perfect.

I still have a few ounces of water after each ride

and a double cavitation / ventilation hit upon full throttle.

Every one I've ridden does the same. Running 13/18.

Stock grate and rideplate

Are you using the stock impeller or the Solas impeller?

Cavitation upon sudden full power acceleration from very slow is typically impeller cavitation, not ventilation.

Ventilation tends to be obvious even with medium/mild acceleration from slow.
Cavitation tends to require a lot of engine power to occur. Unless something (impeller, stator, etc) is damaged.

The Riva Gen 2 intake grate should further reduce impeller cavitation during hard launch, along with the Solas impeller. After those the next upgrade would be the Lucky13 tail cone.

There are other places for water to seep in, such as the driveshaft tube hose clamps. And the large exhaust system hose clamps.

[dijsil]

Does the 09 fx sho suffers from this transom reseal issue?

[K447]

Does the 2009 fx sho suffer from this transom reseal issue?

Well, after thirteen years, is the jet pump ventilating during medium-strong acceleration?

If the transom factory sealant was going to fail, I would imagine it would have done so by now.

[ecarca]

Stupid question since I am doing soon, I assume you put the sealant in the cavity going all around the transom plate, bolts and pipes, as well as a good layer on all the whole mating surface, correct? Basically spread the whole plate, correct?

[LivingSlow]

Stupid question since I am doing soon, I assume you put the sealant in the cavity going all around the transom plate, bolts and pipes, as well as a good layer on all the whole mating surface, correct? Basically spread the whole plate, correct?

Not sure what your plate looks like but yes, do that and the perimeter edge of the plate. Fill the voids so you get a nice bead on there.

[chris1200]

Stupid question since I am doing soon, I assume you put the sealant in the cavity going all around the transom plate, bolts and pipes, as well as a good layer on all the whole mating surface, correct? Basically spread the whole plate, correct?

[K447]

… sealant in the cavity going all around the transom plate … layer on all the whole mating surface … ?

SVHO transom plate, epoxy fill the casting voids to improve sealing of the jet pump

[K447]

The grooves molded into the transom plate casting are where the majority of the sealing occurs.

The thin curved lip where the transom plate seals to the upper half of the pump inlet tunnel does not have a groove for sealant. Filling the semi-circular arched cavities with cured epoxy provides a broader surface for the 3M sealant to bond and grip the transom plate in that curved area.

[ecarca]

Thank you! No incentive to fill the inside surfaces? In the sense as making the same as you did but putting extra in the surfaces that are not covered? Or would that then be too much material and end up being counter productive?

[ecarca]

SVHO transom plate, epoxy fill the casting voids to improve sealing of the jet pump

Thank you! I did read that thread indeed and was planning to do so. I have JB Weld Marine but I guess the normal one that cures faster will be just as good for this use. Any particular reason not to fill it with silicone as well? Just to obtain that hard extra mating surface? Cheers.