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Old 07-30-2004, 04:56 PM
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Default transom flex

how much if any is acceptable. i hadnt noticed before but i shook the cowl today with one hand in the water motor in down position and the transom flexes a very little bit, less than 1/16" off movement....should i worry or is this normal....at what point in movement should i not use the boat ?

boat is 21 ' stamas with 225 1988 johnson...
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Old 07-30-2004, 05:26 PM
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Default RE: transom flex

Have it checked out asap-the transome should not flex, you don't say what kind of boat you have or the size engine.
You should be able to pick up the boat by the transome.
If you have flex and a large engine on it, it could crack/breakaway on excelleration and the engine could join you in the cockpit, not a very desireable thing to happen.
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Old 07-30-2004, 05:42 PM
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Default RE: transom flex

One gel crack, I go nuts. No gel cracks and I'm happy.
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Old 07-30-2004, 05:46 PM
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Default RE: transom flex

on the motor well towards the transom there is gell cracks......
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Old 07-30-2004, 06:06 PM
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Default RE: transom flex

Do you see any water weeping from AROUND the motor mount bolt holes or Around the perimeter of the drain fixture when she is one the trailer for awhile???

When you tap on the transom in different spots, does it sound thuddy in spots and more solid in others.

If this is true than you have water instrusion, and the rot process has begun. Ratz

If your hull in 31 years old, well this is expected. I do not think you will want to replace the transom, so sealing the gel cracks and putting new 5200 in the motor bolt holes will be the next order of business, as well as thinking about adding a 1/2" SS plate between the motor bracket and the hull to spread the load over a larger reinforced surface.

This will probably need a little more discussion as to the pros and cons to the Nth degree, so I will now let the other members of the forum help you to find a solution that extendes the life of your toy.
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Old 07-30-2004, 06:19 PM
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Default RE: transom flex

thanks, bull, i plan on taking it out tommrow morning but i'm just gonna idle around fish and put it on the trailer and get it surveyed ?
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Old 07-30-2004, 06:24 PM
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Default RE: transom flex

Transoms flexing - nope it shouldn't happen, it should be rock solid!

It sure would be a big time drag if you were pounding some heavy seas and your transom broke off w/engine and fell into the depths , and then the boat follows. I think your next move is to hire a surveyor to check it out if you are not comfortable with the hammer test.
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Old 07-30-2004, 06:40 PM
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Default RE: transom flex

A 1/16 is not bad, so don't get your panties in a bunch, just yet.
Then use your knuckles and IF you get a thud, see if you can push in on this spot with you thumbs, indictating one or more blisters or soft spots. A few blisters can be fixed over the winter, as it takes time to dry out the wood with heat lamps, even after removing the fiberglass, but this could be overkill compared to my original suggestion.
We are talking degree here so check it out tomorrow before and after you go out, and get back to us.
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Old 07-30-2004, 06:59 PM
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Default RE: transom flex

I don't know about you guys, but I for one could not see a 1/16" over a 8' span that is divided with a large engine on it. How are you seeing this 1/16"? Are you running a straigth edge or plumb line from gunnel to gunnel and then tugging on the engine?

If this is how you are doing this; with the boat under power this 1/16" will be much greater!
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Old 07-30-2004, 07:34 PM
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Default RE: transom flex

1/16" i just looking down from top and guessing its 1/16", its really little movement.....the thickness of 2 pennys or less

my guess is if you shake 500 pounds its bound to move the transom right...? even in a newer boat.
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Old 07-30-2004, 08:20 PM
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Default RE: transom flex

I checked my transom by trimming the motor up and putting just about all my weight on the prop and bouce up and down to look and feel for flex. Do this varying the amount of pressure to look for flex. The boat should just bouce up and down on the trailer. Rap on the transom with a rubber mallet and listen for hollow sounds. Everything should be solid sounding. If you have a bilge access, you can check the wood in your transom with an ice pick or scredriver and "stab" at them checking for solidness. Soft spots, depending on where and how many, can be an issue.
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Old 07-30-2004, 08:25 PM
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Default RE: transom flex

i know on my stamas when i did my repower, from the factory they used epoxy resin to coat the inside of the mounting holes before they put the bolts in that goesnt sound like allot of flex who knows maybe normal if you have a big outboard on it
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Old 07-30-2004, 08:28 PM
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Default RE: transom flex

strike, yes it a big outboard at 225hp 2 stroke v6 thats runs like a champ....
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Old 07-30-2004, 08:42 PM
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Default RE: transom flex

Out of all respect, lets nix the ice pick idea. Don't really need any more holes in the glass for for the time being.
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Old 07-30-2004, 11:17 PM
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Default RE: transom flex

A plastic faced hammer works the best to test the Thud test. With the boat on the trailer and a 2nd person to help.
Raise the motor all the way and put the lock on it in the up position. Have the helper grap the skeg of the motor
and bounce on it while YOU watch the transom for flex. There should be None.
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Old 07-31-2004, 12:29 AM
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Default RE: transom flex

How olds the 21' Stamas?
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Old 07-31-2004, 08:40 AM
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Default RE: transom flex

In order to test my transom, here is what I did. I have an old pro-line with a 1992 evinrude 225. I tilt the motor up, until it is almost as far as it will go, then I sit on the lower unit and jump up and down. My transom does not appear to flex at all, however, the boat and trailer do jump up and down with me. I can not detect any flex at all in my transom. If just shaking your motor a little causes the transom to flex, think about what happens when you are traveling through rough water, or when you are powerloading the boat on the trailer, or when you are plowing to get on plane, and that 225 is pushing for all its worth.

I have seen people rebuild transoms, from the inside out which is no easy or cheap task, and I have also seen people have a stainless or aluminum plate fabricated to reinforce the area. The plate solution seems to work, but if your stringers are weak, the transom plate wont help that at all. You dont want to be offshore and have the transom crack open and let in the sea. Also, if you reinforce the transom, but the stringers are weak, the hull could conceivably seperate at the transom. I hate to be a worry wart, but I have seen it happen before.
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