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I have a 22' 1985 Guardian which I am restoring. The problem is I have these twin Yamaha F100 four strokes with 25" shaft that I would like to use on the Boat. I get some advise that the motors might be too long and too heavy for this Boat that it might sit too low into the water. Do you think that it's really necessary to raise the transom height or could I just mount it and enjoy the ride? any ideas would be greatly appriciated!!

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Here is a photo of a 22 Outrage - Whalerdrive with twin Honda 4-stokes (115's I think) that look very stern heavy to me, click on the link below. If your hull does not have a Whalerdrive I would suspect with twin 4-strokes it will also look very stern heavy. Maybe someone else with a similar set up can chime in? Hope this helps.

http://members.aol.com/bburtensha/alk...ileaft.jpg

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I am not sure about a Guardian 22, but the Outrage 22 requires 20" shaft engines for a twin engine installation. I suppose it is possible that a Guardian could have been ordered with a taller transom.

I will get out and measure from the keel to the top of the transom on my boat so you would have something to compare your boat's keel to top of transom dimension with. Then you would know what shaft length would be required.

On the subject of weight, compare the weight of the two Yamahas with the weight of twin 120 OMC outboards of the same vintage as your hull. At least that would give you a number to think about. I think you will find, as Mike said above, that the twin 4 strokes may be heavier than you would like on that hull. It would probably handle it OK, but not ideal.

Doug

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If it helps. My 2003 F115 weights 402 dry.

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peska671,

Talk to a yamaha outboard mechanic. Those 100's may just have a spacer and shaft extension that made them 25" shafts. You also may consider moving the console closer to the bow.

Todd

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My 1982 22' Outrage is fitted with twin 1986 120hp Evinrudes and the trim is okay. When stern to the waves I do take some water from time to time. Not bad but it does happen. I would love to know what my motors weigh but haven't a clue. I found two 20" F100's for a reasonable price and was seriously considering them until my wife showed me our FAFSA contribution for our daughter's college tuition for next year. I believe the weight was 379lbs each. They are based on the same block as the 90hp and not the 115hp and therefore lighter. To me the 25" shafts wouldn't be a problem. Raise them with a setback bracket. That would get the vital parts higher off the water and hopefully cut down on corrosion.

Jeff

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We have 20" shafts on our twin Merc 150's on the back of the guardian. Even with set backs or jackplates the motors will not perform like you would want them to. Also I will say with the added weight of the Guardian Hull I would be the twin four stroke 100's might be disappointing for performance. Twin 100 two strokes would fair better due to they are lighter and have a much stronger torque curve than the four strokes.

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But who makes or has made 100hp 2 strokes recently.


Jeff

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Did some research:
The Honda 115 four stroke weighs in at 496lbs each, plus the weight of the whalerdrive on the picture .
Yamaha 100 four stroke weighs 379lbs each.
Mercury 115 two stroke weighs 353lbs each
Mercury Optimax 115 442lbs each
Evenrude E-Tec 115 349lbs each

Now, with only 52lbs more weight for the pair compared to the Merc 115 two strokes, do you think the weight will make a huge difference?

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The Whalerdrive increases the total horsepower and weight ratings, my 25 can handle 950lbs or 450hp, 2-strokes. Not sure what the ratings are with a 22 ORWD, maybe someone can advise? I think with a notched transom, 758lbs will be abit excessive. Will it make a difference when operating the boat, I don't know. I would expect more water coming into the splashwell.

In the picture I posted above, I guess that is 992lbs worth of Honda 4-stroke on that 22 ORWD, that would exceed the weight rating on my hull..

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Tom Clark will probably chime in here sometime about the 22 Whalerdrive ratings.

I believe he has said that a different times, Whaler rated the 22 Whalerdrive at 300 HP and 400 HP.

Doug

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The Outrage 22, when equipped with Whaler Drive was rated for 300 HP, 60 HP more than the 240 HP rating of the notched transom Outrage 22. Other 22 foot Whaler Drive models had rating of 400 HP and 450 HP, the later only seen on the Temptation model. It seemed to be the factory's whim that dictated what the maximum horsepower rating was for the Whaler Drive models.

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All the notched transom 22 foot (classic) Whaler models have transoms that are designed for a 25" shaft length single outboard or twin 20" shaft length outboards. You cannot effectively use twin 25" twins on these boats without the use of jack plates to raise the motors to a functional height, but the use of jack plates is a fine workaround.

22 foot Whaler Drive equipped models use a single 25" shaft length motor or twin 25" shaft length motors, not 20".

The 22' Guardian is equipped in standard form with the same notched transom of the Outrage model and takes the same shaft length motors. Some Guardians were built with the option of a 30" reinforced transom which would allow the use of twin 25" shaft length motors as well as higher horsepower.