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Old 28 September 2010, 19:04   #51
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I have twin 40hp yammys on one of my seariders.
Looking closely at your twin engined transom it looks like you have set them down a good 1" or so below normal height. Doesn't this low setting tend to increase the chances of it falling on to the chines? Did you experiment with different setting to arrive at this?
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Old 28 September 2010, 19:09   #52
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Its hard to see on the photo's but the 40's are raised a couple of inches above the transom for perfect prop allignement with the chimes. (Yes I did have a play with them) Pain in the arse
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Old 30 September 2010, 09:46   #53
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One dive club I was with had a 5.4 with twin 40 mariners and she really didn't like carrying any weight. Personally a big single every time.

Ian
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Old 06 October 2010, 16:38   #54
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Soozook DT90: not many of them around, but if you could find one, it would be a super motor on a SR5.4. It's a 60 deg V4, 1.5 litre, good on juice and bags of grunt. Basically a de-tuned DT100, produced in the mid to late '90s to replace the ageing DT85, before Soozook went all 4-stroke on us.
One here, only 1250 - cheap:

http://www.boatsandoutboards.co.uk/view/PAA14995
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Old 06 October 2010, 16:57   #55
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Thanks DM, one vote for the twins then!
I wonder what insurers would say about overpowering a SR with the 115hp I know it's often done but could it be a problem?
Has anybody got true performance figures for a Yam90 5.4?
I,ve got a searider with a transome plate rated to 120hp.I think you will find its only military spec ones that have had the uprated plates Twin 40hp four strokes i have had for a year.Very quiet smooth and thought they were great.you loose though on fuel economy then range service costs heavey on the transom.Long shafts need to have the transom cut otherwise they cavitate badly and the water level is very close to cut out. 90hp yam is best like chewy has said .I have had 4 seariders two with yams and by far the best. Insurance for overrated engines or overweight.I contacted Porthcawl who i am with they said as long as the transome has been strenghtend they have no problem as modern fourstrokes are heavy. JSP,s 115 was scarey
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Old 06 October 2010, 17:16   #56
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Its hard to see on the photo's but the 40's are raised a couple of inches above the transom for perfect prop allignement with the chimes.
That rings a bell

Yam 90 2 stroke followed by Toohotsu every time if new probably buy a TLDI 90. I understand that Yamaha are bringing out a new lightweight 4 stroke range with the 90 being of comparitive weight to the 90 2 stroke but it's probably about 82k

I Like twins on any boat so 40 s or 50's would be great
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Old 07 October 2010, 05:13   #57
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Twin vs single- here we go again........

The drag argument is going to take on a whole differnet angle at that kind of HP. two reasons -1) the 40s will have substantially smaller gearboxes & legs than the 90, so less frontal area. 2) the whole rig wil lbe travelling a lot slower (in the bigger picture) than something with 300 hanging on the back.

Now, drag through water is equivalent to approx the square of your speed and the cube of your frontal area. Net result - at that kind of HP the differnece is verging on negligible (as shown above).


Now, as has already been pointed out, with a single you need an aux. bang goes the diddy weight saving. Boat full of divers - what would you rather have? a 6Hp aux or a 40? Lack of PT? you just do what I did with my old Yam- go out & play with it for an afternoon - find the optimuim place for the pins.


In this case, I'd probably go with the twins.

As an aside, I bet if you looked around you could find a couple of suitable PT units to retro fit.
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Old 07 October 2010, 18:09   #58
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Brand new Suzuki dt90.. Lightweight compared to some other 90's.. New streamlined gear casing .. Great economy...!!
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Old 07 October 2010, 18:26   #59
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Brand new Suzuki dt90.. Lightweight compared to some other 90's.. New streamlined gear casing .. Great economy...!!
That would be a DF90
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Old 07 October 2010, 18:46   #60
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That would be a DF90
Apologies you're dead right.. That was a typo on my end.. Damn iPhone !!! 
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